{"title":"Barlows, Correctors, \u0026 Reducers","description":"\u003cp\u003eBarlows, Reducers, and Correctors all adjust the light path of your telescope system in a very specific way. Barlow lenses extend the focal length of your telescope, while reducers shorten the focal length. Correctors and flatteners remove optical aberrations from your telescope.\u003c\/p\u003e\n\u003cp\u003eDon't see what you're looking for? Contact us so we can help!\u003c\/p\u003e","products":[{"product_id":"tpo-1-25-focal-reducer-0-5x-with-25mm-extension","title":"TPO 1.25\" Focal Reducer - 0.5X with 25mm Extension","description":"\u003cspan style=\"color: #000000;\"\u003e\u003cstrong\u003eThe Third Planet Optics 0.5x focal reducer\u003c\/strong\u003e\u003c\/span\u003e screws on to any 1.25-inch eyepieces barrel and provides a nominal reduction of 0.5X. This package comes with a 25 mm extension tube for further reduction. The actual focal length reduction will vary a little depending on where the focal reducer is placed in the optical path. The reducer features a 2-element fully multi-coated optical design and blackened lens edges in a black anodized aluminum filter cell. It also has additional 1.25-inch filter threads, so you can screw\/stack additional filters on to this reducer. Will work with all Meade DSI cameras, the Meade LPI, the Celestron NexImage, the Orion StarShoot cameras and most CCD cameras that use a 1.25-inch nosepiece!\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003eOPT Product Number: \u003cspan style=\"color: #000000;\"\u003e\u003cstrong\u003eOS-FR\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c!-- split --\u003e\n\u003cul\u003e\n\u003cli\u003eBlackened Lens Edges\u003c\/li\u003e\n\u003cli\u003e2 Element Fully Multi-Coated Optics\u003c\/li\u003e\n\u003cli\u003eStackable Threaded Design\u003c\/li\u003e\n\u003cli\u003eNominal Reduction of 0.5X\u003c\/li\u003e\n\u003cli\u003eSize: 1.25-inch\u003c\/li\u003e\n\u003cli\u003eIncludes a 25 mm Extension Tube!\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"TPO","offers":[{"title":"Default Title","offer_id":12282574897216,"sku":"OS-FR","price":24.95,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1594\/4815\/products\/77a3021f97966e29111faab9ee27a1dd.jpg?v=1553305911"},{"product_id":"baader-2x-vip-barlow-vipb","title":"Baader 2X VIP Barlow - 1.25\"","description":"\u003ch3\u003eBaader 1.25\" VIP Barlow - 2X\u003c\/h3\u003e\nThe Baader Planetarium VIP Modular Barlow is a complete high quality 2X photo-visual barlow system. The VIP (VIsual and Photographic) barlow is ingeniously designed for functionality and flexibility. It consists of several modular component parts, which enable you to configure the barlow for multiple visual and imaging uses. Designed to accept 1.25\" eyepieces and fit 1.25\" focusers, it also incorporates a 2\" section for use in 2\" focusers. The eyepiece holder uses dual nickel plated clamp screws for maximum convenience and security, and incorporates a captive spring bronze lock ring to prevent any possibility of damage to your eyepieces. As with all Baader Planetarium products, the quality of machining and detail of design is unsurpassed. The internal surfaces are all fully sharp V-threaded and blackened to eliminate stray light reflections. Surfaces are finely machined and satin anodized for function and appearance, and the pieces all fit closely and precisely. The heart of the VIP modular barlow is its precision air-spaced negative lens assembly. The large 24mm clear diameter of the optics minimizes vignetting, and its apochromatic field-flattening design makes it well suited for high power planetary observing as well as for CCD cameras. Both lens elements are polished to a very high standard, and fully multi-coated, using the finest 7 layer multi-coatings available today (reflections per surface are less than 0.2% !). The result is a sharp, high-contrast image that is virtually unaffected by its passage through the barlow. One of the distinguishing features of the VIP Modular Barlow is its construction from multiple interchangeable parts. The structural building blocks of the barlow interconnect using standard T-2 (42mm) threading, enabling you to easily configure the system for multiple uses. The VIP barlow accepts both 1.25\" and 2\" filters, giving you the maximum flexibility to incorporate filtration for visual or photographic use. The T-2\/1.25\" nosepiece barrel is threaded for standard 1.25\" filters, and the 2\"\/1.25\" reducer (#15) is threaded to accept 2\" filters (see the schematic for details). Please note: we have found variations amongst threading used by filter manufacturers, and filter fittup may vary depending on filter manufacturer (we have found some Lumicon and older University filters that fit snugly, or fully thread on but continue to spin even though fully and safely seated due to short threads and large thread reliefs ). The VIP Modular Barlow makes an ideal companion to CCD cameras. Its large clear diameter will illuminate even the largest CCD detectors, and its apochromatic field flattening design will maintain the image quality of your primary optics. The modularity of the VIP barlow system makes it easy to position the lens at the correct distance for a 2X amplification factor. For example, with an SBIG ST7\/8\/9\/10 series camera, the distance from the detector to front T-threaded mounting surface is 0.920\" (23.4mm) (data from SBIG). In order to set the nominal 2X distance (68mm), you would use a total of three 15mm extension tubes (#25A) in between the 1.25\" nosepiece (#14 on the schematic) and CCD camera (i.e. you would need to acquire one additional 15mm extension tube, since two are already included as part of the VIP Barlow). Or, you could include a T-2 Changer System in place of one of the 15mm extension tubes (the changer is also 15mm thick), and permit rapid removal and replacement of the camera or parfocal focusing eyepiece. In order to use the barlow as a 2X photographic amplifier, you simply uncouple the barlow at the first 15mm extension tube (#25A-1) and attach the barlow to your 35mm camera's T-ring. This will result in the proper spacing for a 2X factor. Baader Planetarium Product Number: \u003cb\u003eVIPB\u003c\/b\u003e\n\u003cstyle\u003e\u003c\/style\u003e","brand":"Baader","offers":[{"title":"Default Title","offer_id":44876594762,"sku":"BA-VIPB","price":237.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1594\/4815\/products\/3617_938x684_072d18df-214e-4b57-a807-cc3e901d6fa7.jpg?v=1627572828"},{"product_id":"tk-texdx0001-fsq-85-extender-ed","title":"Takahashi FSQ-85 Extender ED","description":"\n\u003ch3\u003eTakahashi - 1.5X Extender ED\u003c\/h3\u003e\n The Takahashi 1.5X Extender ED was created specifically for the \u003ca href=\"http:\/\/www.optcorp.com\/product.aspx?pid=11546\" target=\"blank\"\u003eTakahashi Baby Q Telescope\u003c\/a\u003e. Thanks to the addition of extra low dispersion (ED) glass, you'll enjoy superb optical quality and enhanced correction.  Now you can add focal length to your \"Baby Q\" to suit all your astrophotography needs. The Takahashi Extender ED has a 2\" barrel and adds 1.5X magnifying power to all your eyepieces when used as a barlow lens.  Takahashi Product Number: \u003cb\u003eTEXDX0001 \u003c\/b\u003e (replaces TKA31595)\n\u003cstyle\u003e\u003c\/style\u003e","brand":"Takahashi","offers":[{"title":"Default Title","offer_id":44877683658,"sku":"TK-TKA37595","price":650.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1594\/4815\/products\/97c3e917b0d045370e7f99fda7072f70.jpg?v=1531938271"},{"product_id":"takahashi-2x-barlow-extender-tbl0002","title":"Takahashi 2X Barlow - 1.25\"","description":"\n\u003ch3\u003eTakahashi 2X Barlow 1.25\" Extender\u003c\/h3\u003e\n\nIf you're looking for a good quality barlow lens to match up with the color correction of Takahashi apochromatic fluorite refractors, then here's your choice. The Takahashi 2X Barlow 1.25\" Extender was designed to be used in the optical path before a star diagonal to provide a 2X magnification factor.  This two-element achromatic doublet is fully multi-coated with internally blackened threads for maximum contrast, and its short (3.5\") means it can also be used in the optical path after a diagonal as well - although the magnification factor will be diminuished.  The Takahashi 2X Barlow 1.25\" Extender is designed with a non-marring compression ring interior to securely hold your eyepieces in proper position, and instead of tiny screws to get lost - employs a knurled, twistable collar to tighten everything into perfect place.  Takahashi quality... All the way!  Takahashi Product Number: \u003cb\u003eTBL0002\u003c\/b\u003e","brand":"Takahashi","offers":[{"title":"Default Title","offer_id":44878832458,"sku":"TK-TKA00597","price":166.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1594\/4815\/products\/da2894de55d81e76cf00347a9ba9af68.jpg?v=1553306203"},{"product_id":"planewave-66x-reducer-for-the-12-5-14-and-17-cdks","title":"PlaneWave .66x Reducer for the CDK12.5, CDK14, and CDK17","description":"\u003cp\u003eThis is a reducer designed specifically for flat field telescopes like the CDK. This reduces the f ratio of the CDK telescope 66%. The f\/6.8 telescopes will be reduced to about f\/4.5 and the f\/8 telescope down to f\/5.3.\u003c\/p\u003e\n\u003cp\u003eThere are two different models, one for the CDK12.5, CDK14, and CDK17; and one for the CDK20 and CDK24. Though these are optically identical, they are mechanically different. See chart in the image gallery for specific performance applications.\u003c\/p\u003e","brand":"Planewave","offers":[{"title":"Default Title","offer_id":44881673482,"sku":"PI-125166","price":1400.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1594\/4815\/products\/78bc21c6985fcbf537b43fbd3e5d0eee.jpg?v=1500425431"},{"product_id":"planewave-66x-reducer-for-cdk20-and-cdk24","title":"PlaneWave .66x Reducer for CDK20 and CDK24","description":"\n\u003ch3\u003ePlaneWave Instruments - .66x Reducer for CDK20 and CDK24\u003c\/h3\u003e\nThis is a reducer designed specifically for flat field telescopes like the CDK. This reduces the f ratio of the CDK telescope 66%. The f\/6.8 telescopes will be reduced to about f\/4.5 and the f\/8 telescope down to f\/5.3.  There are two different models, one for the CDK12.5, CDK14, and CDK17; and one for the CDK20 and CDK24. Though these are optically identical, they are mechanically different.  PlaneWave Instruments Product Number: \u003cb\u003e200166\u003c\/b\u003e","brand":"Planewave","offers":[{"title":"Default Title","offer_id":44881674058,"sku":"PI-200166","price":1400.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1594\/4815\/products\/0f93f182f574dca061c72d59f40339d5.jpg?v=1500425458"},{"product_id":"ht-sca-fft58-sca-field-flattener","title":"Hotech SCA Field Flattener","description":"\u003cp\u003eThe HoTech SCA Field Flattener is fully multi-coated on two-element lens allowing the most efficient light transmission without sacrificing the precious collected light from your telescope. It accommodates f\/5 to f\/8 refractor telescopes.\u003c\/p\u003e\n\u003cp\u003eYou will see bright and sharp image across the entire field. To capture great images from your telescope, it is essential to position your camera firmly in and on the optical axis of your drawtube\/visual back. The SCA T-Adapter center loads your camera in the drawtube\/visual back with a simple threading of a compression ring forcing the built-in rubber rings outward radially, thereby centering the camera in the drawtube\/visual back for optimal installation. All drawtube\/visual back have manufacturing tolerances, and it requires larger diameter to accept various eyepieces and adapters. When the camera adapter is inserted, the gap between the drawtube\/visual back and the inserting device became a slop problem. The rubber rings in the SCA expand radially according to users own adjustment to fill the gaps. This makes your camera seats firmly in your drawtube\/visual back becoming part of your telescope for a secure and repeatable installation.\u003c\/p\u003e\n\u003cp\u003eThe optical axis can be shifted when the inserting device is locked in by a thumbscrew. In some cases, some poorly made unified compression ring can cause unstable tilt when locking in the drawtube due to loose tolerances between the compression ring, inner groove, and the uneven tip of the locking thumbscrew in a drawtube. The SCA T-Adapter adapts your camera without using the thumbscrew or the unified compression ring. (Note: Camera T-Ring not included.) Small imperfections inside the drawtube like dents and scratches, the rubber rings fill the gaps and faithfully centers your camera in the tube. In addition, even if the drawtube is slightly deformed in diameter, egg-shape, the rubber rings in the SCA will compensate the differences and faithfully centers your camera. Short profile design keeps the installed camera stable from low frequency oscillation transferred from the telescope in a windy environment.\u003c\/p\u003e\n\u003cp\u003eThe back focus of a 2-inch SCA T-Adapter is 19 mm (0.75-inch) and 1.25-inch SCA T-Adapter is 18 mm (0.71-inch) measured from drawtube shoulder to the bottom T-Thread. The all-around adjustable tightness rubber contact damps unwanted vibrations from the telescope provides you a sturdy attachment on your telescope for a stable image capture.\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003eSCA Field Flattener has built-in standard 2\/48 mm (M48 x 0.75) filter thread. T-ring thread accepts all kinds of 35 mm cameras. It is yet another dream come true for imagers! HoTech Product Number: \u003cb\u003eSCA-FFT58\u003c\/b\u003e\u003c\/p\u003e\n\u003cstyle\u003e\u003c\/style\u003e","brand":"HOTECH","offers":[{"title":"Default Title","offer_id":44882453450,"sku":"HT-SCA-FFT58","price":175.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1594\/4815\/products\/28ad77333447927558da6e7781c5a92e.jpg?v=1596151532"},{"product_id":"takahashi-reducer-cr-0-73x","title":"Takahashi Reducer CR 0.73x","description":"\u003cp\u003eThe Takahashi ReducerCR changes the Mewlon-250CRS to an f\/7.3 wider field imager yet with the larger image scale for larger objects.\u003c\/p\u003e\n\u003cp\u003eThe reducer can also be use on the CCA-250, Mewlon 300CRS, and FSQ-106EDX4\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eReducer CR 0.73x\u003c\/li\u003e\n\u003cli\u003eEffective focal ratio f\/7.2\u003c\/li\u003e\n\u003cli\u003eEffective focal length 2160mm\u003c\/li\u003e\n\u003cli\u003eImage circle 35mm diameter\u003c\/li\u003e\n\u003c\/ul\u003e\nTakahashi Product Number: \u003cb\u003eMCR0073\u003c\/b\u003e","brand":"Takahashi","offers":[{"title":"Default Title","offer_id":44883851402,"sku":"TK-TKA82580","price":850.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1594\/4815\/products\/Takahshi-Reducer-CR0.73x.jpg?v=1521068463"},{"product_id":"tk-mcr0015-mewlon-1-5x-extender","title":"Takahashi Mewlon 1.5X Extender","description":"\n\u003ch3\u003eTakahashi Mewlon 1.5X Extender\u003c\/h3\u003e\n\nThe Takahashi Extender CR produces a very large image scale for the very small objects.  Stellar sizes in the center are 2 microns for the C-F line and 3 microns for the g line, well beyond the diffraction limit. This image size is suitable for any CCD camera or digital SLR with an appropriate sized sensor.\n\u003cul\u003e\n\u003cli\u003eExtender CR 1.5x\u003c\/li\u003e\n\u003cli\u003eEffective focal ratio f\/14.9\u003c\/li\u003e\n\u003cli\u003eEffective focal length 4475mm\u003c\/li\u003e\n\u003cli\u003eImage circle 44mm diameter\u003c\/li\u003e\n\u003c\/ul\u003e\nTakahashi Product Number: \u003cb\u003eMCR0015\u003c\/b\u003e","brand":"Takahashi","offers":[{"title":"Default Title","offer_id":44883860042,"sku":"TK-TKA82595","price":650.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1594\/4815\/products\/6e057f1f3f739e3bb70844c9ea166bde_545c8f79-e913-4fab-aaf0-73da08ef8c60.jpg?v=1553305451"},{"product_id":"ba-glass-3-glasspath-corrector-1-2-6","title":"Baader Glasspath Corrector - 1:2.6","description":"\u003ch3\u003eBaader Glasspath Corrector - 1:2.6 - Maxbright and Mark V Binoviewers\u003c\/h3\u003e\r\n\r\n\r\n\r\n\r\nThe Baader Glasspath Compensator serves multiple functions.  In addition to correcting the color error caused by the long light-path through the binoviewer glass prisms (glasspath), the compensator also magnifies and extends the focal point of the telescope.   This focal extending aspect is key to being able to use a binocular viewer in most telescopes.  Due to the basic design of all binocular viewers, the distance that light must travel through the viewer is on the order of 4.5\" or more (the Maxbright is the shortest viewer we know of, at 110mm).   Many telescopes, especially Newtonians, do not have sufficient back-focus in order to reach focus with such an optically long accessory (ie, not enough focuser in-travel).  By using a Baader compensator, the focal point of the telescope can be extended sufficiently to accommodate the length of the binoviewer.\r\n\r\n\r\n\r\n\r\n\u003ch6\u003eBaader Glasspath Corrector shown with optional Nosepiece and Baader Maxbright Binoviewer\u003c\/h6\u003e\r\n\r\n\r\n\r\nA secondary benefit of the compensator is to provide additional magnification - ahead of the binoviewer.  For high magnifications (ie, planetary observation), it is generally preferable to magnify the image before the binoviewer, rather than to use shorter focal length eyepieces.   By magnifying prior to the viewer, the effects of any optical tolerances and misalignments in the centering of the eyepieces are reduced.    A compensator enables the use of longer focal length eyepieces to achieve high magnifications, which tend to have longer eye relief (greater comfort) than short focal length eyepieces.  It is also less expensive to purchase an additional compensator (to provide additional magnifications), rather than to purchase additional sets of eyepieces.  In general, for binoviewing use we recommend eyepieces with focal lengths of 8mm or longer.\r\n\r\n \r\n\r\nFor these reasons, many users find it is very useful to have more than one compensator.  We recommend first choosing the lowest powered compensator that will allow your scope to reach focus.  This will permit the widest possible fields of view.  In addition,  one or more higher powered compensators can be added to give a greater range of magnifications. \r\n\r\n\r\n\r\n\r\n\r\n\r\nBaader Planetarium Product Number:  \u003cb\u003e2456317 \u003c\/b\u003e","brand":"Baader","offers":[{"title":"Default Title","offer_id":44885906954,"sku":"BA-GLASS-3","price":138.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1594\/4815\/products\/8ab63212cd6e59e5862378f21e542d65_a4bdcdad-5ea6-4ec0-9a6f-2f689cb2a2c4.jpg?v=1561063031"},{"product_id":"tele-vue-paracorr-type-2","title":"Tele Vue Paracorr Type 2","description":"\n\u003cp style=\"text-align: left;\"\u003e\u003cspan style=\"color: #000000;\"\u003e\u003cstrong\u003eThe Televue Paracorr Type 2\u003c\/strong\u003e\u003c\/span\u003e after the original Paracorr (parabola corrector) was developed in 2010 and made specifically to pair with newer 'ladder-less' ultra fast, f\/3-f\/4 Dobsonian telescopes, now Tele Vue brings you the newest evolution in Paracorr correction.\u003c\/p\u003e\n\n Coma makes stars look like blurry comets whose tails point out radially from the center of the field. The faster your scope's speed, the worse the effect. All parabolic mirrors used in Newtonian reflecting telescopes are limited in field sharpness due to coma. Even a perfectly made 13-inch\" f\/4.5 parabola has only about 0.1 degree diffraction limited field.  Previous attempts to correct for coma have been limited in usefulness. Some correctors were designed mainly for astrophotography. Dedicated coma correcting eyepieces were another approach. However, these were limited to 50 degree apparent fields and would orphan your existing eyepiece collection. \u003cspan style=\"color: #000000;\"\u003e\u003cstrong\u003eThe Tele Vue Paracorr is a universal corrector\u003c\/strong\u003e\u003c\/span\u003e that tightens and intensifies star images on all f-ratios from f\/3 to f\/4 without adding any false color or spherical aberration! You no longer have to constantly shift a Dobsonian to keep objects centered for sharp viewing. While using a Tele Vue eyepiece, place M-13 at the edge of the field and your can now enjoy resolving its beauty as it drifts across your view. The Tele Vue Visual Paracorr is easy to use. It slips into your focuser, just like a Barlow. To minimize focuser in-travel, due to additional length, a mild 15 percent Barlow-effect was designed into the Paracorr to effectively push the focus out. A Paracorr is recommended for use with all Tele Vue eyepieces because our Plossls, Radians, Panoptics, Naglers, and Ethos achieve higher levels of aberration correction than competitive models. However, the Paracorr is also compatible with other eyepiece makes.  \u003cspan style=\"color: #000000;\"\u003e\u003cstrong\u003eThe Paracorr Type 2\u003c\/strong\u003e\u003c\/span\u003e is both a visual and photographic corrector and is compatible with Televue imaging systems. Try a Paracorr on your \"DobNewt.\" We think you'll agree that the revolution is complete!  As you've read, all Newtonian\/Dobsonian telescopes can benefit from using a Televue Paracorr (Parabola Corrector) to eliminate coma in the image. One aspect to optimizing this correction is the distance of the eyepieces focus point (field stop location) to the last surface of the Paracorr lens (within a small +\/- tolerance of course). Typical eyepieces used with fast Newtonians can have field stop locations differing by as much as half an inch. \n\u003cp\u003e\u003cspan style=\"color: #000000;\"\u003e\u003cstrong\u003eWords From Al Nagler About the Televue Visual Paracorr:\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003ci\u003e\"I have built Newtonian reflectors since my high school days and still enjoy observing with my 12\" f\/5.3. Knowing how the Nagler eyepiece complemented fast Dobsonians and Newtonians by removing eyepiece induced astigmatism, I now became intolerant of the inherent defect of coma in a parabolic mirror. I decided to try to achieve the same field quality for parabolas as reached by my Nagler eyepiece and 4-element refractor designs. Existing coma correctors seemed to be limited in color correction, spherical aberration and convenience in use. Paracorr (parabola corrector) uses 2 multi-coated, high index doublets, is completely color-free - center and edge, and installs like a Barlow. Coma is corrected so well, the diffraction limited field area of an f\/4.5 Dob\/Newt is increased 36 times!\" - \u003c\/i\u003eAl Nagler OPT Product Number: \u003cb\u003eTE-VIP-2010\u003c\/b\u003e  \u003cem\u003eAll Televue products are available to ship world-wide from OPT, and effective July 1, 2008, are covered by a Five Year Worldwide Limited Product Warranty! Always be sure to save your original packaging materials should you need to return any Televue product for warranty or repair. \u003c\/em\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"Tele Vue","offers":[{"title":"Default Title","offer_id":44886298890,"sku":"TE-VIP-2010","price":511.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1594\/4815\/products\/Televue-Parcoor.jpg?v=1553308844"},{"product_id":"op-19407-lepus-0-62x-reducer","title":"Optec Lepus 0.62x Reducer","description":"\u003cp\u003eOptec brings you a reducer for your corrected SCT. Compatible with the Meade ACF, this accessory will allow you to shorten the exposure time of your astroimages.\u003c\/p\u003e\n\u003cp\u003eBuilt with a huge 100mm of back focus, Optec has left plenty of room to accommodate any CCD and filter wheel combo or DSLR with room to spare! If you want to purchase a reducer for a Celestron EdgeHD scope, please purchase the specific reducer for your size EdgeHD telescope.\u003c\/p\u003e\n\u003c!-- split --\u003e\n\u003cul\u003e\n\u003cli\u003eDesigned for Midsize CCD's and DSLRs\u003c\/li\u003e\n\u003cli\u003eDelivers a 22mm diameter image without vignetting and can also provide well-corrected images up to 28mm with only minor light fall-off.\u003c\/li\u003e\n\u003cli\u003eFlat fielding is recommended for the best results.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- split --\u003e\n\u003cul\u003e\n\u003cli\u003eOptec Lepus 0.62x Reducer\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Optec","offers":[{"title":"Default Title","offer_id":44887801546,"sku":"OP-19407","price":225.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1594\/4815\/products\/Optec-Lepus-0.62x-Reducer.jpg?v=1634071506"},{"product_id":"takahashi-1-7x-cq-extender-for-fs-60q-tfk6004qm","title":"Takahashi 1.7X CQ Extender Module for FS-60Q","description":"\n\u003ch3\u003eTakahashi FS-60Q 1.7X CQ Module\u003c\/h3\u003e\n\nThe Takahashi FS-60Q is a new version of the FS-60CB. The FS-60Q includes a module which contains a 1.7x extender, which changes the FS-60Q to a 600mm focal length f\/10 instrument. This module is offered separately and is compatible with any FS-60C ever made to covert it to the Q when the 1.7x module is attached. This conversion is as simple removing the white tube from the focuser, attaching the 1.7x module to the focuser and then attaching the section with the objective in it to the 1.7x module.  The in place extender, flattens the image to a 44mm circle with 96% illumination to allow imaging the Moon, planets or a solar eclipse. The larger image scale of the 60mm focal length allows prominences and the corona to be more easily seen or imaged with a digital SLR. Used with the Extender-Q the FS-60Q becomes an f\/16 960mm telescope that will be able to view some of the smaller lunar craters and produce a 9mm lunar image on a sensor from its 40mm image circle.  The Tak 1.7x CQ module can be easily removed which will convert the FS-60Q to an FS-60CB f\/5.9. Now the dedicated reducer [.72x] f\/4.2 and dedicated flattener can be used to image at f\/6.2 for flat field or wide field imaging. Now, the F\/5.9 FC-60CB can be used for wide field observing. Further, the Takahashi1.7x CQ module is sold separately for the owners of FS-60C, CSV’?????????s and CB’?????????s which converts them into the FS-60Q with all of the benefits the module enables, as mentioned previously.  Versatility is that word that best describes the FS-60Q modular telescope. Converts from an f\/10 600mm focal length instrument to an f\/5.9 354mm wide field instrument that can be used to image at f\/6.2 using the dedicated flattener or to f\/4.2 with the dedicated reducer. Both devices providing a 44mm image circle which will cover an APS size chip or used at f\/10 with a 44mm flat field 95% illuminated to narrow field imaging; or extended with the Extender-Q to 960mm for lunar, nature or eclipse imaging at f\/16 with a 40mm image circle. \n\n\u003ch3\u003eTakahashi FS-60Q 1.7X CQ Features.\u003c\/h3\u003e\n\n\u003cul\u003e\n\u003cli\u003eType: Fluorite 2 +\u003c\/li\u003e\n\u003cli\u003eEffective aperture: 60mm\u003c\/li\u003e\n\u003cli\u003eFocal length: 600mm\u003c\/li\u003e\n\u003cli\u003eFocal ratio: f\/10\u003c\/li\u003e\n\u003cli\u003eTube diameter: 80mm\u003c\/li\u003e\n\u003cli\u003eTube length\" 407mm [16.02’?????????] - [FS-60Q] 280mm [11.02’?????????] - [FS-60CB]\u003c\/li\u003e\n\u003c\/ul\u003e\nThe CQ 1.7x module is sold separately and it allows current FS-60C owners to convert their model into a model ’?????????Q’????????? by adding the CQ module to their tube assembly. Each Takahashi FS-60Q is supplied with a set of covers for the QE module which will allow the scope to be made into tow assemblies, the FS-60CB and the QE module for easy airline transport. This is perfect for eclipse chasing.  Takahashi Product Number: \u003cb\u003eTFK6004QM \u003c\/b\u003e","brand":"Takahashi","offers":[{"title":"Default Title","offer_id":44889498762,"sku":"TK-TKA20595","price":496.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1594\/4815\/products\/90946ebd059904483fb5f6a0b71eaf89_1eaa430b-7ae3-4a89-a480-08acfa48fdc8.jpg?v=1553315972"},{"product_id":"tk-trd0060-trd0060-field-flattener-fs60c","title":"Takahashi TRD0060 Field Flattener - FS60C","description":"\n\u003ch3\u003eTakahashi TRD0060 Field Flattener\u003c\/h3\u003e\n\n Flattener Reducer to F\/4.2 for FS-60C (More information as it becomes available.)  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This negative length 92mm - 72mm adapter puts the reducer inside the CAA so that it can reach infinity focus using the standard TCA1020 and TCDXXXX adapter for your specific CCD camera.\u003c\/p\u003e","brand":"Takahashi","offers":[{"title":"Default Title","offer_id":44889911178,"sku":"TK-TKA36002","price":79.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1594\/4815\/products\/165f449064941155e8b42d15f89b674b.jpg?v=1553305487"},{"product_id":"sw-s20201-reducer-corrector-for-pro-100-ed","title":"Sky-Watcher Reducer \/ Corrector for EvoStar 100 ED","description":"\u003cp\u003eThis 0.85x Focal Reducer\/Corrector for Sky-Watcher EvoStar 100 ED APO is designed for serious Astro-Imagers. Optimized for the Sky-Watcher EvoStar 100 ED (also known as the Pro ED 100) APO, this superb quality accessory effectively reduces the telescope's focal length by a factor of 0.85x and provides much improved field-edge correction.\u003c\/p\u003e\n\u003c!-- split --\u003e\n\u003cul\u003e\n\u003cli\u003e0.85 Focal Reduction Rate\u003c\/li\u003e\n\u003cli\u003eProvides superb field-edge correction\u003c\/li\u003e\n\u003cli\u003eOptimized for use with Sky-Watcher EvoStar 100 ED Apochromat\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- split --\u003e\n\u003cul\u003e\n\u003cli\u003eSky-Watcher Reducer \/ Corrector for EvoStar 100 ED\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Sky-Watcher","offers":[{"title":"Default Title","offer_id":44893353418,"sku":"SW-S20201","price":380.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1594\/4815\/products\/6cc03ca5c26fdbdf9f250d4058e504c6.jpg?v=1500438541"},{"product_id":"sw-s20202-reducer-corrector-for-pro-120-ed","title":"Sky-Watcher Reducer \u0026 Corrector for EvoStar 120 ED","description":"\u003cp\u003e0.85x Focal Reducer\/Corrector for Sky-Watcher EvoStar 120 ED APO is designed for serious Astro-Imagers. Optimized for the Sky-Watcher EvoStar 120 ED (also known as the Pro ED 120) APO, this superb quality accessory effectively reduces the telescope's focal length by a factor of 0.85x and provides much improved field-edge correction.\u003c\/p\u003e\n\u003c!-- split --\u003e\n\u003cul\u003e\n\u003cli\u003eFocal Length Reduction: 0.85x\u003c\/li\u003e\n\u003cli\u003eCorrects the edge of field\u003c\/li\u003e\n\u003cli\u003eOptimized for the Sky-Watcher EvoStar 120 ED APO\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- split --\u003e\n\u003cul\u003e\n\u003cli\u003eSky-Watcher Reducer \/ Corrector for EvoStar 120 ED\u003c\/li\u003e\n\u003cli\u003eTwo Year Limited Warranty\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Sky-Watcher","offers":[{"title":"Default Title","offer_id":44893360970,"sku":"SW-S20202","price":395.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1594\/4815\/products\/ca7468466ad930a8d547b9b74f8bcb50.jpg?v=1500438553"},{"product_id":"orion-field-flattener-for-short-refractors","title":"Orion Field Flattener for Short Refractors","description":"\u003cp\u003e\u003cspan style=\"color: #000000;\"\u003e\u003cstrong\u003eThe Field Flattener for Short Refractors by Orion:\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003eOptically fast refractor telescopes used for astrophotography are often plagued by significant field curvature, which is especially noticeable when using CCD imagers with APS-C sized and larger sensors, or DSLR cameras. Orion's handy field flattener resolves the issue by providing excellent field correction while preserving the focal length attributes of your telescope. Designed for use with refractors with focal lengths of 400 mm to 650 mm and focal ratios of f\/5 to f\/7.5, the Orion Field Flattener for Short Refractors lets you enjoy the full imaging potential of your fast refractor telescope. \u003c\/p\u003e\n\u003cp\u003eFully multi-coated, 38 mm clear aperture optics and a glare-reducing threaded interior ensure maximum image contrast. Backfocus of 55 mm is required, we recommend using the Orion T-thread Spacer Ring Kit (sold separately) to achieve proper distance for use with CCD imagers. Use with a DSLR requires a T-ring for the camera (T-ring sold separately). Weighs 7.5-ounces.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cspan style=\"color: #000000;\"\u003e\u003cstrong\u003eOrion Field Flattener for Short Refractors Features:\u003c\/strong\u003e\u003c\/span\u003e\n\u003cul\u003e\n\u003cli\u003eEliminate field curvature in short, optically fast refractor telescopes with this handy 38 mm clear-aperture, fully multi-coated field flattener\u003c\/li\u003e\n\u003cli\u003eDesigned for use with 400 mm to 650 mm focal length refractors with f\/5 to f\/7.5 focal ratios\u003c\/li\u003e\n\u003cli\u003eOptimizes your fast refractor telescope for astrophotography\u003c\/li\u003e\n\u003cli\u003ePreserves focal length attributes of the attached refractor telescope while flattening the field of view\u003c\/li\u003e\n\u003cli\u003eRequires 55 mm of refractor telescope backfocus, weighs 7.5-ounces\u003c\/li\u003e\n\u003c\/ul\u003e\nOPT Product Number: \u003cb\u003eOR-08893\u003c\/b\u003e","brand":"Orion","offers":[{"title":"Default Title","offer_id":44893483914,"sku":"OR-08893","price":149.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1594\/4815\/products\/download-2021-04-29T113217.212.png?v=1619717575"},{"product_id":"or-8894-0-8x-focal-reducer-for-refractor-telescopes","title":"Orion 0.8x Focal Reducer for Refractor Telescopes","description":"\u003cp\u003e\u003cstrong\u003eThe 0.8x Focal Reducer for Refractor Telescopes by Orion:\u003c\/strong\u003e Some of the most picturesque celestial objects are too large to fit in the field of view of an imaging refractor and camera. What's more, most objects in deep space are very faint and therefore challenging to image without taking very long exposures, increasing the potential for error. Our new Orion 0.8x Focal Reducer for Refractors addresses these obstacles by increasing your refractor telescope's field of view while reducing the effective focal length by a factor of 0.8x, thereby providing a shorter, more optically\u003cem\u003e fast\u003c\/em\u003e focal ratio to increase astrophotography efficiency. Using the 0.8x focal reducer not only enables your refractor telescope to acquire a larger field of view, but also makes it capable of capturing bright, vividly detailed astrophotos in considerably less time. The Orion 0.8x Imaging Focal Reducer's fully multi-coated, 38 mm clear aperture optics are housed in a sleek, all-machined, anodized aluminum body. Internal glare-threads provide maximum image contrast and brightness. It is designed for use with any refractor telescope equipped with a 2-inch focuser, and requires 55 mm of backfocus. Use with a DSLR and appropriate T-ring combination will not require use of any spacers. For use with a CCD astrophotography camera with less backfocus, we highly recommend using the Orion T-thread Spacer Ring Kit (sold separately) to achieve proper distance. You can further enhance your astrophotos by using 2-inch imaging filters with the Orion 0.8x Imaging Focal Reducer since it is conveniently threaded for use with 2-inch filters. Unit weighs 6.2 oz.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"color: #000000;\"\u003e\u003cstrong\u003eOrion 0.8x Focal Reducer for Refractor Telescopes Features:\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eReduces an astrophotography refractor's effective focal length by a factor of 0.8x, providing a shorter, more optically fast focal ratio\u003c\/li\u003e\n\u003cli\u003eDesigned for use with any refractor telescope equipped with a 2-inch focuser\u003c\/li\u003e\n\u003cli\u003eEnables a refractor to both acquire a larger field of view and to capture bright, detailed astrophotos in considerable less time\u003c\/li\u003e\n\u003cli\u003eFeatures fully multi-coated, 38 mm clear aperture optics housed in a sleek, machined and anodized aluminum body\u003c\/li\u003e\n\u003cli\u003eRequires 55 mm of backfocus\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003eOPT Product Number: \u003cb\u003eOR-08894\u003c\/b\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"Orion","offers":[{"title":"Default Title","offer_id":44894267658,"sku":"OR-08894","price":149.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1594\/4815\/products\/download-2021-04-29T113040.141.png?v=1619717469"},{"product_id":"optec-lepus-hd-telecompressor-c11-edgehd-edition","title":"Optec Lepus HD Telecompressor C11 EdgeHD Edition","description":"\u003cp\u003eOptec's Lepus HD Telecompressor for Celestron C11 EdgeHD Edition is a Lepus 0.62X Telecompressor Lens System.\u003c\/p\u003e\n\u003cp\u003eMounted in a 3.25-inch x 24tpi threaded holder for direct attachment to Celestron 1100 EdgeHD SCT. This three-piece lens mounting system includes a lens holder, spacer, and orange retaining ring. \u003cspan\u003eFor use with any Lepus or VLC camera mount having the Optec-2100 2.1-inch dovetail receiver.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003eThe close coupled mount provides optimal image quality by maintaining a minimum distance between EdgeHD corrector optics and Lepus telecompressor lens grouping. The back-focus distance is reduced to 100 mm on-axis and maintained by a camera specific mount (order Lepus camera mount separately). Contact OPT for cameras not listed.\u003c\/p\u003e\n\u003cp\u003e[If you are looking for the camera mount, it is the Celestron 3.25-inch x 24tpi female thread mount \/\/ OP-2100 male dovetail] \u003c\/p\u003e\n\u003cp\u003e OPT Product Number: \u003cb\u003eOP-19411\u003c\/b\u003e\u003c\/p\u003e","brand":"Optec","offers":[{"title":"Default Title","offer_id":44894634634,"sku":"OP-19411","price":295.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1594\/4815\/products\/67968edad78d2d60f1124be0ce870481.jpg?v=1522275981"},{"product_id":"celestron-xcel-lx-2x-barlow-1-25inch-93529","title":"Celestron X-Cel LX 2X Barlow - 1.25\"","description":"\u003ciframe width=\"560\" height=\"315\" src=\"https:\/\/www.youtube.com\/embed\/5wWKjpDR4J8?rel=0\" frameborder=\"0\" allow=\"autoplay; encrypted-media\" allowfullscreen=\"\"\u003e\u003c\/iframe\u003e\n\u003cp style=\"text-align: left;\"\u003e\u003cstrong\u003eHighlights: \u003c\/strong\u003e \u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003e2X magnification when used with any 1.25-inch eyepiece.\u003c\/li\u003e\n\u003cli\u003eEnjoys the optical design and high-quality build of the X-Cel eyepiece line.\u003c\/li\u003e\n\u003cli\u003e3-element optics are fully multi-coated for crisp, high contrast images.\u003c\/li\u003e\n\u003cli\u003eThreaded barrel accepts 1.25-inch Celestron thread-in filters.\u003c\/li\u003e\n\u003cli\u003eUses a brass pressure ring to hold the eyepiece in place without damaging the barrel.\u003c\/li\u003e\n\u003cli\u003eRubber gripping ring, for secure handling.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003c!-- split --\u003e\n\u003cul\u003e\n\u003cli\u003eMagnification: 2X.\u003c\/li\u003e\n\u003cli\u003eEyepiece Compatibility: 1.25 inches.\u003c\/li\u003e\n\u003cli\u003eOptical Coatings: Fully Multi-Coated.\u003c\/li\u003e\n\u003cli\u003eBarrel Size: 1.25 inches.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Celestron","offers":[{"title":"Default Title","offer_id":44895002954,"sku":"CE-93529","price":101.95,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1594\/4815\/products\/2c9653d579be5ce385b07862af2d55de.jpg?v=1571776381"},{"product_id":"baader-2-25x-triplet-hyperion-zoom-barlow-with-t-adapter","title":"Baader 2.25x Hyperion Zoom Barlow - 1.25\" Size","description":"\u003cp\u003eDo you have a Baader Planetarium Hyperion Zoom eyepiece and want even more performance? Then the Baader 2.25X Barlow might just be right for you! The included T2 adapter will allow it to be coupled to any of the 1.25-inch eyepiece holders, or it can be directly attached to a 1.25-inch eyepieces threads with the other included adapter.\u003c\/p\u003e\n\u003cp\u003eAble to be used with any eyepiece that's designed with a 1.25-inch thread, the Baader Planetarium modular design of the 2.25X Triplet Hyperion Zoom Barlow allows for a wide variety of configurations to suit your every need. The primary optical body can be used with either supplied adapter to mate it to a 1.25-inch eyepiece - or the T-Adapter which connects with optional T-Rings for use as a photo projection lens.\u003c\/p\u003e\n\u003cp\u003eWhat's more, you can also change the magnification levels through the use of optional additional 1.25-inch or T-thread spacers or extension tubes.\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"color: #000000;\"\u003e\u003cstrong\u003eBaader 2.25X Triplet Hyperion Zoom Barlow with T-Adapter Features:\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eOptically Matched for perfect optical performance with the Hyperion 8-24 mm Clickstop Zoom.\u003c\/li\u003e\n\u003cli\u003eAnastigmatic Flatfield Design.\u003c\/li\u003e\n\u003cli\u003eAir-spaced triplet lens.\u003c\/li\u003e\n\u003cli\u003eBaader Phantom Group Coatings on all air-glass surfaces\u003c\/li\u003e\n\u003cli\u003eFully internally baffled and blackened to eliminate stray light reflections\u003c\/li\u003e\n\u003cli\u003eEnables dual 2-inch\/ 1.25-inch Barrel Configuration with all Baader Hyperion Clickstop Zooms (MkI to MkIII)\u003c\/li\u003e\n\u003cli\u003eThreaded for standard 1.25-inch filters.\u003c\/li\u003e\n\u003cli\u003eModular Design.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e  \u003c\/p\u003e","brand":"Baader","offers":[{"title":"Default Title","offer_id":44895037834,"sku":"BA-HYP-BARLOW","price":151.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1594\/4815\/products\/a9f81e7c1475e3b22c08933dca0d1eb0.jpg?v=1500441985"},{"product_id":"celestron-reducer-edgehd-1100","title":"Celestron .7x Reducer for EdgeHD 1100","description":"\u003cp\u003e\u003cspan style=\"color: #000000;\"\u003e\u003cstrong\u003eThe Celestron .7x Reducer Lens makes your EdgeHD 1100 one full f-stop faster than f\/10\u003c\/strong\u003e\u003c\/span\u003e, reducing your exposure time by one-half to capture the same object brightness. It maintains a similar flat-field performance as the native EdgeHD optical design while increasing the FOV by 43% to better capture wide-field images.\u003c\/p\u003e\n\u003cp\u003eThe EdgeHD reducer threads directly onto the 3.25-inch threads of your EdgeHD optical tube. This reduces mechanical vignetting and allows for use with larger (full frame) sensors and Off-Axis Guiders. It keeps the identical back focus when used at f\/10 and provides generous back focus to accommodate additional accessories and a wide variety of cameras.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eGAIN BETTER ASTRO-IMAGING AND VIEWING WITH THE CELESTRON EDGEHD 1100 .7X REDUCER\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eQuality Design:\u003c\/strong\u003e 5-element optical layout designed specifically for the EdgeHD 1100 to maintain the flat-field performance of the Edge HD optical design\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaintains the Same Back Focus as When Used at f\/10:\u003c\/strong\u003e Unlike generic reducers the EdgeHD .7x provides generous back focus to accommodate additional accessories and a wide variety of cameras. It also allows use of existing EdgeHD T-Adapters and other Celestron imaging accessories.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOne Full F-stop Faster Than f\/10:\u003c\/strong\u003e Reduces the exposure time by one-half to capture the same brightness of object.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIncrease Field of View by 43%:\u003c\/strong\u003e Better for capturing wide-field images of larger galaxies and nebulae.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLanthanum Glass Elements:\u003c\/strong\u003e EdgeHD reducer uses \"rare earth\" Lanthanum glass elements for clear, high contrast viewing while minimizing chromatic aberration.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFully Multi-coated Lens Elements:\u003c\/strong\u003e All air-to-glass surfaces have multiple layers of coating for maximum light transmission and color correction.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBlackened Edges:\u003c\/strong\u003e All lens elements have blackened edges to minimize internal reflection and maximize contrast.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFull Frame Design: \u003c\/strong\u003eThreads directly onto the 3.25-inch threads of the EdgeHD optical tube. Reduces mechanical vignetting and allows for use with larger (full frame) sensors and Off-Axis Guiders.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClear Aperture:\u003c\/strong\u003e 60 mm clear aperture lens optimized for a 42 mm image circle for use with large CCD sensors.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMachined Aluminum Housing:\u003c\/strong\u003e Computer-assisted CNC machined aluminum housing for precise spacing and alignment of the optical elements.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThreaded metal covers for both ends:\u003c\/strong\u003e To protect your investment from unwanted dust and scratches.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOptimized Versatility:\u003c\/strong\u003e Fastar compatibility and f\/2 imaging with optional accessory. The EdgeHD is the most complete imaging system in its price range.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003eOPT Product Number: \u003cstrong\u003eCE-94241\u003c\/strong\u003e\u003c\/p\u003e\n\u003c!-- split --\u003e\n\u003cul\u003e\n\u003cli\u003eCuts Your Imaging Time in Half!\u003c\/li\u003e\n\u003cli\u003eUse with Your EdgeHD 1100 Telescope.\u003c\/li\u003e\n\u003cli\u003eReduces Your Focal Ratio.\u003c\/li\u003e\n\u003cli\u003e43% Wider FOV.\u003c\/li\u003e\n\u003cli\u003eFits the EdgeHD 1100 Threads.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003c!-- split --\u003e\n\u003cul\u003e\n\u003cli\u003eCelestron EdgeHD .7x Focal Reducer Lens.\u003c\/li\u003e\n\u003cli\u003eThreaded metal lens covers for both ends.\u003c\/li\u003e\n\u003cli\u003e2 Year Warranty.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"Celestron","offers":[{"title":"Default Title","offer_id":44895440586,"sku":"CE-94241","price":839.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1594\/4815\/products\/131b1c537e8daf881fb4b343f5339d2e.jpg?v=1570142693"},{"product_id":"celestron-x-cel-lx-3x-barlow-lens-93428","title":"Celestron X-Cel LX 3x Barlow Lens - 1.25-inch","description":"\u003cdiv style=\"text-align: center;\"\u003e\u003ciframe width=\"560\" height=\"315\" src=\"https:\/\/www.youtube.com\/embed\/5wWKjpDR4J8?rel=0\" frameborder=\"0\" allow=\"autoplay; encrypted-media\" allowfullscreen=\"\"\u003e\u003c\/iframe\u003e\u003c\/div\u003e\n\u003cdiv style=\"text-align: center;\"\u003e \u003c\/div\u003e\n\u003cp\u003eThe latest addition to the X-Cel LX line is perfect for astronomical observing, especially with short focal length telescopes. Fully multi-coated 3-element Apochromatic design offers superior sharpness and color correction. The Celestron X-Cel LX 3x Barlow Lens triples the magnification of your current eyepieces. Perfect for short tube telescope owners that are looking for more power in their lunar or planetary views. Celestron Product Number: \u003cb\u003e93428\u003c\/b\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eA Rubber Grip Helps to Avoid Accidental Drops.\u003c\/li\u003e\n\u003cli\u003eBarrel is Threaded to Accept Standard 1.25-inch Filters.\u003c\/li\u003e\n\u003cli\u003eA Brass Compression Ring Holds Eyepiece Firmly in Place.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Celestron","offers":[{"title":"Default Title","offer_id":44896433930,"sku":"CE-93428","price":119.95,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1594\/4815\/products\/729ff6f98fe0f62afe8dee3d04174ab8.jpg?v=1571956721"},{"product_id":"astro-physics-2inch-advanced-convertible-barlow","title":"Astro-Physics 2\" Advanced Convertible Barlow","description":"\u003cp\u003e\u003cspan style=\"color: #000000;\"\u003e\u003cstrong\u003eThe 2-Inch Advanced Convertible Barlow by Astro-Physics:\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cspan style=\"color: #000000;\"\u003e\u003cstrong\u003e\u003c\/strong\u003e\u003cstrong\u003eThe Astro-Physics Advanced Convertible Barlow\u003c\/strong\u003e\u003c\/span\u003e in the 2-Inch size, has a unique design that provides several configurations to increase the focal length of your telescope. It was designed to match the characteristics of small and medium size CCD chips. It is also ideal for high-power visual observation and lunar-planetary-solar photography.\n\u003cp\u003eThe AP 2-inch Advanced Convertible Barlow can be used conventionally by inserting an eyepiece or a camera's nosepiece into its 2-inch locking adapter. Alternatively, the optic section can be separated from the 2-inch locking adapter and screwed directly into a camera's faceplate, a threaded nosepiece, or extension tubes for a flexure-free fitting. It has both 42 mm and 48 mm threads for versatility.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eAdvanced Convertible Barlow Features:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eFlat field for imaging and visual\u003c\/li\u003e\n\u003cli\u003eVery effective high-tech coatings eliminate ghost images\u003c\/li\u003e\n\u003cli\u003eScrews into front nosepiece of cameras and diagonals\u003c\/li\u003e\n\u003cli\u003eIdeal for medium size CCD sensors\u003c\/li\u003e\n\u003cli\u003eGreater than 98-percent light transmission\u003c\/li\u003e\n\u003cli\u003eLarge field optic eliminates vignetting even with f\/6 optics\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003cspan style=\"color: #000000;\"\u003e\u003cstrong\u003eThis redesigned optic features a flatter field\u003c\/strong\u003e\u003c\/span\u003e, allowing it to be used for deep-sky photography when increased magnification of smaller objects is desired. Naturally, additional exposure time will be required. Changing the spacing distance will change the magnification of the Barlow (90 mm back spacing is ideal, yielding 2.0x magnification). The sweet spot of the flatter field is between 1.8x and 2.5x.\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"color: #000000;\"\u003e\u003cstrong\u003eThe 2-element design\u003c\/strong\u003e\u003c\/span\u003e of the AP 2-Inch Advanced Convertible Barlow preserves the fine color correction of the main objective. The optical elements are precision ground and polished to insure that no aberrations are introduced into the system. The Barlow focal length is 102 mm, which is longer than conventional types. This minimizes the divergence of the edge rays and therefore reduces the apparent vignetting common in many eyepieces. The Barlow features a brass locking ring that clamps eyepieces and accessories securely, yet will not mar their fine surfaces.\u003c\/p\u003e\n\u003cspan style=\"color: #000000;\"\u003e\u003cstrong\u003eThe Advanced Convertible Barlow's flat field\u003c\/strong\u003e\u003c\/span\u003e is optimized for APS-C and smaller sensors (such as the 8300 and 3200 sensors). Using this Barlow with an f\/8 refractor provides round stars over 90-percent of the field, and over 80-percent of the field with an f\/6.3 refractor.\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003eNote the following positions and resulting magnifications (Distance from rear of Barlow to focal plane, measured from 2-inch barrel):\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eMinimum recommended mag: 1.8x, 70 mm back focus distance\u003c\/li\u003e\n\u003cli\u003eNormal magnification: 2.0x, 90 mm back focus distance\u003c\/li\u003e\n\u003cli\u003eMaximum recommended mag: 2.5x, 134 mm back focus distance\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003eOPT Product Number: AP-BARADV \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"Astro-Physics","offers":[{"title":"Default Title","offer_id":44899664970,"sku":"AP-BARADV","price":285.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1594\/4815\/products\/ba5b638e3a6ff23c19ab68b25d934adc.jpg?v=1553288631"},{"product_id":"astro-physics-ccd-focal-reducer-for-f-9-f-18","title":"Astro-Physics CCD Focal Reducer for f\/9-f\/18 Telescopes","description":"\u003cp\u003eThis AP telecompressor will provide full coverage of the ST10E chip with scopes ranging from f\/9 to f\/18 focal ratio. The 2-element cemented design transmits close to 99% of the incoming light over the range of 420 to 700 nm. The focal length of the telecompressor optics is 12 inch. For refractors, the field is compressed by 0.67x (when using a Color Filter Wheel). If you have a moving mirror system, the native focal ratio will increase.\u003c\/p\u003e\n\u003cp\u003eThe design allows full corner-to-corner illumination of the ST-10 and ST-8300 chips with most catadioptric telescopes. This design does not add coma to the wavefront, and thus can be used with all flat-field and coma-free telescopes such as Maksutov-Cassegrains, Schmidt-Cassegrains, Ritchey-Chretiens and refractors. The inherent resolution of the telescope is not compromised when using this compressor. Please review this \u003cspan style=\"color: #00aaff;\"\u003e\u003ca href=\"https:\/\/www.astro-physics.info\/tech_support\/accessories\/photo_acc\/telecompressor-techdata.pdf\" target=\"_blank\" title=\"Telecompression Chart\" style=\"color: #00aaff;\" rel=\"noopener noreferrer\"\u003eTelecompression Chart\u003c\/a\u003e\u003c\/span\u003e to see how this item will fit into your imaging system.\u003c\/p\u003e\n\u003cp\u003eIf you want a higher compression ratio, but do not use the color filter wheel, you can add one or more of the 2 inch Barrel Extension w\/ 48 mm Threads (A3703) between the CCDT67 and the nosepiece of your camera. This has the advantage of inserting the CCDT67 forward in the light cone so that in-travel (backspacing) requirements are reduced. An alternative is to use T-2 extension rings from Baader Planetarium, and thread the 15mm T-2 Extension Ring and 7.5 mm Extension Ring between the CCD camera and the nosepiece. This will approximate the spacing of a color filter wheel. You can also experiment with a single extension or other combinations. Please note that as you increase compression, you decrease the size of the image circle at the focus point.\u003c\/p\u003e\n\u003cp\u003eAt 0.67x, the CCDT67 will cover the chip of the ST-10 and ST-8300. It can never cover the chip of an STL series camera or the newer large size digital SLR chips, because its clear aperture is no larger than their CCD chips.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eThe clear aperture of the AP CCD Telecompressor is 1.75 inch. It is designed to screw into the 2 inch Tapered Nosepiece (AP16T) or any other 2 inch nosepiece with 48 mm threads that is designed for CCD cameras. It will not thread all the way into the nosepiece provided with SBIG cameras since the threads of that nosepiece are not deep enough.\u003c\/li\u003e\n\u003cli\u003e0.67x Compression ratio for SBIG ST7\/8\/10 + Color Filter Wheel, when used with refractors. Fully illuminated circle: 29 mm0.75x Compression ratio for SBIG ST7\/8\/10 (without Color Filter Wheel or T-2 extensions), when used with refractors. Fully illuminated circle: 34 mm\u003c\/li\u003e\n\u003cli\u003eApproximately 5 inches of back focus is needed to achieve focus on the CCD chip. It will not work with the AO7.\u003c\/li\u003e\n\u003cli\u003eThe focal length of the CDD Telecompressor is 12 inch (305 mm).\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- split --\u003e\n\u003cul\u003e\n\u003cli\u003eTelecompressor designed to screw into 2-inch Nosepieces\u003c\/li\u003e\n\u003cli\u003e0.67x Compression Ratio for SBIG ST7\/8\/10 w\/ Refractors and Filter Wheel\u003c\/li\u003e\n\u003cli\u003e0.75x Compression Ratio for SBIG ST7\/8\/10 w\/ Refractors\u003c\/li\u003e\n\u003cli\u003eRequires 5 inch Back Focus\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- split --\u003e\n\u003cul\u003e\n\u003cli\u003eAstro-Physics CCD Telecompressor for f\/9 - f\/18 Telescopes\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Astro-Physics","offers":[{"title":"Default Title","offer_id":44899668362,"sku":"AP-CCDT67","price":189.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1594\/4815\/products\/UT-12132.jpg?v=1596043514"},{"product_id":"takahashi-fc-76d-reducer-tka1858","title":"Takahashi 76D Reducer","description":"\u003ch2 style=\"text-align: center;\"\u003e\u003cstrong\u003eTakahashi FC-76D Reducer\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eThe Takahashi FC-76D Reducer is a dedicated reducer which is compatible with the FC-76, FC-76D and FS-78. The dedicated reducer changes the focal length to 417mm and the f-stop to f\/5.5. The image circle is 36mm.FC-76D + 76D Reducer:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eFocal Length 417mm\u003c\/li\u003e\n\u003cli\u003eF\/ratio f\/5.5\u003c\/li\u003e\n\u003cli\u003eImage circle 36mm\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eFC-76 + 76D Reducer:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eFocal length 438mm\u003c\/li\u003e\n\u003cli\u003eF\/ratio f\/5.8\u003c\/li\u003e\n\u003cli\u003eImage circle 36mm\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eFS-78 + 76D Reducer:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eFocal length 462mm\u003c\/li\u003e\n\u003cli\u003eF\/ratio f\/5.9\u003c\/li\u003e\n\u003cli\u003eImage circle 36mm\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eTakahashi Product Number: \u003cb\u003eTKA1858 \u003c\/b\u003e\u003c\/p\u003e","brand":"Takahashi","offers":[{"title":"Default Title","offer_id":44900012874,"sku":"TK-TKA18580","price":620.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1594\/4815\/products\/2a2360c75cec04610de437fb4f3d5b3f.jpg?v=1553308559"},{"product_id":"celestron-reducer-edgehd-800","title":"Celestron .7X Focal Reducer for EdgeHD 800","description":"\u003cp\u003e\u003cstrong\u003eThe Celestron EdgeHD 800 .7X Focal Reducer\u003c\/strong\u003e features a custom 4-element optical design engineered to maintain the flat-field performance of the EdgeHD optics. Unlike generic reducers, this premium reducer provides substantial back focus (105 mm) to accommodate an assortment of imaging accessories.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eExperience high-contrast viewing with minimal chromatic aberration with the EdgeHD 800\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eOffering extra-low dispersion, its exotic Lanthanum elements provide mesmerizing views. All air-to-glass lens surfaces of the .7X Focal Reducer Lens feature multiple layers of coating for maximum light transmission and color correction. Enjoy blackened edges that minimize internal reflection and maximize image contrast!\u003c\/p\u003e\n\u003cp\u003eThe aluminum housing of the focal reducer has been designed and CNC machined for precise spacing and alignment of the optical elements. Store and transport your reducer safely with its featured threaded metal caps, included as well.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eGain better astro-imaging and viewing with the Celestron EdgeHD 800 Focal Reducer\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eQuality Design:\u003c\/strong\u003e 4-element optical layout designed specifically for the EdgeHD 8-inch to maintain the flat-field performance of the EdgeHD optical design.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e105 mm of Backfocus:\u003c\/strong\u003e Provides generous back focus to accommodate additional accessories and a wide variety of cameras. It also allows the use of existing T-adapters for EdgeHD 800 and other Celestron imaging accessories.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOne Full F-Stop Faster Than f\/10:\u003c\/strong\u003e Reduces the exposure time by one-half to capture the same brightness of an object.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIncrease The Field of View by 43%:\u003c\/strong\u003e Better for capturing wide-field images of larger galaxies and nebulae.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLanthanum Glass Elements:\u003c\/strong\u003e EdgeHD reducer uses Rare Earth Lanthanum glass elements for clear, high contrast viewing while minimizing chromatic aberration.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFully Multi-coated Lens Elements:\u003c\/strong\u003e All air-to-glass surfaces have multiple layers of coating for maximum light transmission and color correction.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBlackened Edges:\u003c\/strong\u003e All lens elements have blackened edges to minimize internal reflection and maximize contrast.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOptimized for APS-C sized sensors:\u003c\/strong\u003e Including most DSLR cameras and Nightscape CCD cameras\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMachined Aluminum Housing:\u003c\/strong\u003e Computer-assisted CNC machined aluminum housing for precise spacing and alignment of the optical elements.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThreaded Metal Covers for Both Ends of The Lens Assembly:\u003c\/strong\u003e To protect your investment from unwanted dust and scratches.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eComplete Image System:\u003c\/strong\u003e Provides an intermediate focal length between the telescope (f\/10) and the optional Hyperstar accessory at f\/2, making the EdgeHD the most-complete imaging system in its price range.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e OPT Product Number: \u003cstrong\u003e\u003cspan style=\"color: #000000;\"\u003eCE-94242\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003c!-- split --\u003e\n\u003cul\u003e\n\u003cli\u003eHigh-contrast Viewing!\u003c\/li\u003e\n\u003cli\u003e.7x Focal Reducer.\u003c\/li\u003e\n\u003cli\u003eDouble your Equivalent Exposure Time.\u003c\/li\u003e\n\u003cli\u003e4-Element Lens Design.\u003c\/li\u003e\n\u003cli\u003eProvides 105 mm Back Focus.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003c!-- split --\u003e\n\u003cul\u003e\n\u003cli\u003eCelestron .7X Focal Reducer for EdgeHD 800.\u003c\/li\u003e\n\u003cli\u003e2 Year Warranty.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"Celestron","offers":[{"title":"Default Title","offer_id":44900691274,"sku":"CE-94242","price":409.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1594\/4815\/products\/UT-12052.jpg?v=1570142629"},{"product_id":"tpo-2-coma-corrector-cc2","title":"TPO 2\" Coma Corrector","description":"\u003cp\u003ePlace this TPO 2 inch Coma Corrector completely inside a 2 inch focuser for a high grade of correction with a low degree of vignetting. Connects f\/4 or slower Newtonian telescopes with a 2 inch barrel and 2 inch female filter threads to cameras with M48x0.75 male threads, providing better field illumination and sharpness than with a T2 corrector. Features an ample back focus of 70mm, allowing for the use of off-axis guiders. Includes M48 to T2 adapter.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003eTPO Product Number: CC2\u003c\/p\u003e\n\u003c!-- split --\u003e\n\u003cul\u003e\n\u003cli\u003eFor f\/4 or Slower Newtonian Telescopes\u003c\/li\u003e\n\u003cli\u003eFor Cameras w\/ M48x0.75 male Threads\u003c\/li\u003e\n\u003cli\u003eBack Focus: 70mm\u003c\/li\u003e\n\u003cli\u003eSize: 2 inch\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"TPO","offers":[{"title":"Default Title","offer_id":12285961863232,"sku":"OS-CC2","price":115.95,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1594\/4815\/products\/2inch-coma-corrector_1.jpg?v=1506359852"},{"product_id":"takahashi-toa130-reducer-camera-ring-tka31580n","title":"Takahashi TOA-35 0.7X Reducer \u0026 Camera Ring - TOA-130","description":"\u003cp\u003eThe ideal design for a reducer is its ability to reduce the f-stop while flattening the field and controlling chromatic aberration. The Takahashi TOA-35 0.07x reducer is configured with 4-elements in three groups and uses low dispersion, high refractive index glass for two of the elements, while reducing the focal length by a factor of 30%.\u003c\/p\u003e\n\u003cp\u003eThe Tak TOA-35 reducer produces 3-micron stars in the center of the field and 6-micron stars at the edge with a very flat field. There is also an improvement in the color correction. The 0.7X Reducer is supplied with a wide mount 55mm adapter to attach the reducer to the customer's camera.\u003c\/p\u003e\n\u003ch3 style=\"text-align: center;\"\u003eTakahashi TOA-35 0.7x Reducer Specifications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eFocal Length (installed on TOA-130): 698mm\u003c\/li\u003e\n\u003cli\u003eFocal Ratio (installed on TOA-130): f\/5.4\u003c\/li\u003e\n\u003cli\u003eImage Circle: 44mm\u003c\/li\u003e\n\u003cli\u003eMetal Back Distance: 71.5mm\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Takahashi","offers":[{"title":"Default Title","offer_id":44903632394,"sku":"TK-TKA31580NS","price":1320.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1594\/4815\/products\/38a159d736c756b056910302ffea455f.jpg?v=1500458267"},{"product_id":"takahashi-toa150-reducer-camera-ring-tka32580n","title":"Takahashi TOA-35 0.7X Reducer \u0026 Camera Ring - TOA-150, TSA-102\/120","description":"\u003cspan style=\"color: #000000;\"\u003e\u003cstrong\u003eThe TOA-150 0.7X Reducer and Wide Camera Mount Set by Takahashi:\u003c\/strong\u003e\u003c\/span\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003eThe ideal design for a reducer is its ability to reduce the f-stop while flattening the field and controlling chromatic aberration. The Takahashi TOA-35 0.07x reducer is configured with 4-elements in three groups and uses low dispersion, high refractive index glass for two of the elements, while reducing the focal length by a factor of 30-percent.\u003c\/p\u003e\n\u003cp\u003eThe Tak TOA-35 reducer produces 3 micron stars in the center of the field and 6 micron stars at the edge with a very flat field when used with the TOA-150. Images sizes for the TSA-102 and 120 are 8 microns at center and 12 microns at the edge. There is also an improvement in the color correction on all models. The 0.7X Reducer is supplied with a wide mount, 55 mm adapter to attach the reducer to the customer's camera.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"color: #000000;\"\u003e\u003cstrong\u003eTakahashi TOA-35 0.7x Reducer Specifications:\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eFocal Length (installed on TOA-150): 775 mm\u003c\/li\u003e\n\u003cli\u003eFocal Length (installed on TSA-102): 575 mm\u003c\/li\u003e\n\u003cli\u003eFocal Length (installed on TSA-120): 635 mm\u003c\/li\u003e\n\u003cli\u003eFocal Ratio (installed on TOA-150): f\/5.2\u003c\/li\u003e\n\u003cli\u003eFocal Ratio (installed on TSA-102): f\/5.6\u003c\/li\u003e\n\u003cli\u003eFocal Ratio (installed on TSA-120): f\/5.3\u003c\/li\u003e\n\u003cli\u003eImage Circle (all models): 44 mm\u003c\/li\u003e\n\u003cli\u003eMetal Back Distance (all models): 68.5 mm\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cem\u003e\u003cspan style=\"color: #000000;\"\u003e\u003cstrong\u003eNote:\u003c\/strong\u003e\u003c\/span\u003e Image shows both models of the TOA-35 Reducer (TOA-130 \u0026amp; TOA-150\/TSA). You will only receive one of them.\u003c\/em\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"Takahashi","offers":[{"title":"Default Title","offer_id":44903639882,"sku":"TK-TKA32580NS","price":1320.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1594\/4815\/products\/76140f92bca8fbe7ce78c2bd9f50c0e5.jpg?v=1500458281"},{"product_id":"es-2x-extender-125","title":"Explore Scientific 2X Focal Extender - 1.25\"","description":"An Explore Scientific Focal Extender does exactly what the name implies; it extends the effective focal length of the lens that it is used in conjunction with, thus producing higher magnifications for imaging and visual applications. Focal extenders, or tele-extenders, are similar to a Barlow or tele-negative lens, but there is one important difference between the two that you will want to take into consideration, especially if you plan to use the Explore Scientific Focal Extender for imaging and astro-photography. When you use a standard Barlow or tele-negative lens to increase the magnification of your optical system, your results will be dependent on where you place the Barlow in the optical chain. For instance, if you put a 2X Barlow lens in front of your diagonal instead of behind it (Barlow-Diagonal-Eyepiece as opposed to Diagonal-Barlow-Eyepiece), you won't get 2X magnification in both set-ups. The magnification varies with placement. However, with an Explore Scientific Focal Extender, even if the distance is changed, the magnification remains the same. You can place your Focal Extender anywhere along the optical chain between an eyepiece or a camera, and if you are supposed to get 2X magnification, you will get 2X magnification. When it comes to imaging, this is a critical difference, because you may want to introduce an accessory like a flip mirror or filter wheel in between the Focal Extender and a CCD camera, which would increase the distance to the focused image. This difference in design allows users to rest easy, whether they are pumping up the magnification of a lower power eyepiece for visual observations or using their Explore Focal Extender in imaging applications.\n\u003cspan style=\"color: #ff0000;\"\u003e\u003cb\u003eExplore Scientific Focal Extender Highlights\u003c\/b\u003e\u003c\/span\u003e\n\u003cspan style=\"color: #ff0000;\"\u003e\u003cb\u003e\u003c\/b\u003e\u003c\/span\u003e\n\u003cb\u003e\u003c\/b\u003e\n\u003cp\u003e\u003cb\u003eMore Magnification Choices without Sacrificing Eye Relief\u003c\/b\u003e A good Focal Extender adds some real versatility to your telescope accessory line-up. First of all, it allows you to increase the magnification of any eyepiece with the same barrel size that you already own. In other words, 3 eyepieces offer 6 magnification choices with the addition of a focal- or tele-extender. Secondly, most of the time, lower magnification eyepieces have better eye relief than higher power models. When using a Explore focal extender to increase your magnification, you get to enjoy the generous eye relief of the lower power eyepiece, and that's quite a bonus, especially for eyeglass wearers or for those with fast telescopes who can really push high magnification eyepieces. Remember, Explore Scientific manufactures focal extenders in 2X, 3X and 5x models, so there is something for every style of telescope.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eOptimized Optical Design\u003c\/b\u003e Explore Focal Extenders are optimized through each design, fabrication, and testing process to produce high contrast, high resolution images.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eDurable Coatings \u0026amp; Finishing Touches\u003c\/b\u003e Each of the four elements in your Explore Scientific Focal Extender is fully multi-coated with EMD enhanced coatings, resulting in bright, sharp images; and every element has blackened edges to reduce internal reflections and increase contrast.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eTapered Barrel for Extra Security\u003c\/b\u003e The insert barrel of each Explore Scientific extender is double-tapered to allow smooth insertion to, and removal from, a telescope's eyepiece holder, focuser or diagonal, however the wide dimension of the taper helps prevent the focal extender from falling out of the telescope should the set-screw holding it in place become loose.\u003c\/p\u003e\n\u003c!-- split --\u003e\n\u003cul\u003e\n\u003cli\u003eBarrel Size: 1.25\"\u003c\/li\u003e\n\u003cli\u003eDoubles the magnification of a compatible eyepiece\u003c\/li\u003e\n\u003cli\u003eDurable and long lasting\u003c\/li\u003e\n\u003cli\u003eOptimized in visual quality\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- split --\u003e\n\u003cul\u003e\n\u003cli\u003eExplore Scientific 2X Focal Extender - 1.25\"\u003c\/li\u003e\n\u003cli\u003eEnd Caps\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Explore Scientific","offers":[{"title":"Default Title","offer_id":44904587018,"sku":"ES-FE02-125","price":199.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1594\/4815\/products\/cf772fee796aedf197819d81cb1597c4.png?v=1553314947"},{"product_id":"tpo-1-25inch-pt5-focal-reducer","title":"TPO 1.25\" Focal Reducer - 0.5X","description":"\u003cp\u003eThe TPO 0.5x focal reducer screws onto any 1.25\" eyepiece barrel and provides a nominal reduction of 0.5X. The actual focal length reduction will vary a little over or under 0.5x depending on where the focal reducer is placed exactly in the optical path. The TPO .5X reducer features a 2-element fully multi-coated optical design and blackened lens edges in a black anodized aluminum filter cell. It also has additional 1.25\" filter threads, so you can screw\/stack additional filters on to this reducer.\u003c\/p\u003e\n\u003cp\u003eThe actual reduction will vary a little over or under 0.5x depending on exactly where the focal reducer is placed in the optical path. The exact focal length specification of this reducer has not been provided by the manufacturer, but we estimate it to be approximately 101-103mm. Hence, the \"working distance\" of this specific reducer is estimated to be 51mm, i.e., this reducer will provide a reduction of 0.5x when the center of its lens assembly is placed 51mm from the focal plane of the eyepiece or imaging device. Move the focal reducer closer to the eyepiece\/camera and its reduction factor will increase. Move it away and the reduction provided will decrease.\u003c\/p\u003e\n\u003cp\u003eBy using additional spacers or extension tubes (sold separately), you can vary the amount of reduction you obtain with this reducer as follows:\u003c\/p\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eExtra Spacer Length\u003c\/th\u003e\n\u003cth\u003eNominal Reduction Provided\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccenter\u003e0\" \/ 0mm\u003c\/center\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003ccenter\u003e0.50x\u003c\/center\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccenter\u003e0.25\" \/ 6.4mm\u003c\/center\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003ccenter\u003e0.44x\u003c\/center\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccenter\u003e0.5\" \/ 12.7mm\u003c\/center\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003ccenter\u003e0.38x\u003c\/center\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccenter\u003e0.75\" \/ 19.1mm\u003c\/center\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003ccenter\u003e0.31x\u003c\/center\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccenter\u003e1\" \/ 25.4mm\u003c\/center\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003ccenter\u003e0.25x\u003c\/center\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cbr\u003e\n\u003cp\u003eTPO Product Number: \u003cspan style=\"color: #000000;\"\u003e\u003cstrong\u003eFR-ONLY\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c!-- split --\u003e\n\u003cul\u003e\n\u003cli\u003eBlackened Lens Edges\u003c\/li\u003e\n\u003cli\u003e2 Element Fully Multi-Coated Optics\u003c\/li\u003e\n\u003cli\u003eStackable Threaded Design\u003c\/li\u003e\n\u003cli\u003eNominal Reduction of 0.5X\u003c\/li\u003e\n\u003cli\u003eSize: 1.25 inches\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- split --\u003e\n\u003cul\u003e\n\u003cli\u003eTPO 1.25\" Focal Reducer - 0.5X\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"TPO","offers":[{"title":"Default Title","offer_id":12284859187264,"sku":"OS-FR-ONLY","price":19.95,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1594\/4815\/products\/2f317ae7d83d58c2ccb8546feea94d54.jpg?v=1553305947"},{"product_id":"es-3x-extender-125","title":"Explore Scientific 3X Focal Extender - 1.25\"","description":"An Explore Scientific Focal Extender does exactly what the name implies; it extends the effective focal length of the lens that it is used in conjunction with, thus producing higher magnifications for imaging and visual applications. Focal extenders, or tele-extenders, are similar to a Barlow or tele-negative lens, but there is one important difference between the two that you will want to take into consideration, especially if you plan to use the Explore Scientific Focal Extender for imaging and astro-photography. When you use a standard Barlow or tele-negative lens to increase the magnification of your optical system, your results will be dependent on where you place the Barlow in the optical chain. For instance, if you put a 3X Barlow lens in front of your diagonal instead of behind it (Barlow-Diagonal-Eyepiece as opposed to Diagonal-Barlow-Eyepiece), you won't get 3X magnification in both set-ups. The magnification varies with placement. However, with an Explore Scientific Focal Extender, even if the distance is changed, the magnification remains the same. You can place your Focal Extender anywhere along the optical chain between an eyepiece or a camera, and if you are supposed to get 3X magnification, you will get 3X magnification. When it comes to imaging, this is a critical difference, because you may want to introduce an accessory like a flip mirror or filter wheel in between the Focal Extender and a CCD camera, which would increase the distance to the focused image. This difference in design allows users to rest easy, whether they are pumping up the magnification of a lower power eyepiece for visual observations or using their Explore Focal Extender in imaging applications.\n\u003cb\u003eExplore Scientific Focal Extender Highlights\u003c\/b\u003e\n\u003cb\u003e\u003c\/b\u003e\n\u003cb\u003e\u003c\/b\u003e\n\u003cp\u003e\u003cb\u003eMore Magnification Choices without Sacrificing Eye Relief\u003c\/b\u003e A good Focal Extender adds some real versatility to your telescope accessory line-up. First of all, it allows you to increase the magnification of any eyepiece with the same barrel size that you already own. In other words, 3 eyepieces offer 6 magnification choices with the addition of a focal- or tele-extender. Secondly, most of the time, lower magnification eyepieces have better eye relief than higher power models. When using a Explore focal extender to increase your magnification, you get to enjoy the generous eye relief of the lower power eyepiece, and that's quite a bonus, especially for eyeglass wearers or for those with fast telescopes who can really push high magnification eyepieces. Remember, Explore Scientific manufactures focal extenders in 2X, 3X and 5x models, so there is something for every style of telescope.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eOptimized Optical Design\u003c\/b\u003e Explore Focal Extenders are optimized through each design, fabrication, and testing process to produce high contrast, high resolution images.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eDurable Coatings \u0026amp; Finishing Touches\u003c\/b\u003e Each of the four elements in your Explore Scientific Focal Extender is fully multi-coated with EMD enhanced coatings, resulting in bright, sharp images; and every element has blackened edges to reduce internal reflections and increase contrast.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eTapered Barrel for Extra Security\u003c\/b\u003e The insert barrel of each Explore Scientific extender is double-tapered to allow smooth insertion to, and removal from, a telescope's eyepiece holder, focuser or diagonal, however the wide dimension of the taper helps prevent the focal extender from falling out of the telescope should the set-screw holding it in place become loose.\u003c\/p\u003e\n\u003c!-- split --\u003e\n\u003cul\u003e\n\u003cli\u003eIncreases eyepiece magnification by 3X\u003c\/li\u003e\n\u003cli\u003eBarrel Size: 1.25\"\u003c\/li\u003e\n\u003cli\u003eDurable and Long Lasting\u003c\/li\u003e\n\u003cli\u003eMinimal impact on eye relief\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- split --\u003e\n\u003cul\u003e\n\u003cli\u003eExplore Scientific 3X Focal Extender - 1.25\"\u003c\/li\u003e\n\u003cli\u003eEnd Caps\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Explore Scientific","offers":[{"title":"Default Title","offer_id":44906138378,"sku":"ES-FE03-125","price":209.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1594\/4815\/products\/5aa1778716ad1cd7b98109850a9355eb.png?v=1553279820"},{"product_id":"es-5x-extender-125","title":"Explore Scientific 5X Focal Extender - 1.25\"","description":"An Explore Scientific Focal Extender does exactly what the name implies; it extends the effective focal length of the lens that it is used in conjunction with, thus producing higher magnifications for imaging and visual applications. Focal extenders, or tele-extenders, are similar to a Barlow or tele-negative lens, but there is one important difference between the two that you will want to take into consideration, especially if you plan to use the Explore Scientific Focal Extender for imaging and astro-photography. When you use a standard Barlow or tele-negative lens to increase the magnification of your optical system, your results will be dependent on where you place the Barlow in the optical chain. For instance, if you put a 5X Barlow lens in front of your diagonal instead of behind it (Barlow-Diagonal-Eyepiece as opposed to Diagonal-Barlow-Eyepiece), you won't get 5X magnification in both set-ups. The magnification varies with placement. However, with an Explore Scientific Focal Extender, even if the distance is changed, the magnification remains the same. You can place your Focal Extender anywhere along the optical chain between an eyepiece or a camera, and if you are supposed to get 5X magnification, you will get 5X magnification. When it comes to imaging, this is a critical difference, because you may want to introduce an accessory like a flip mirror or filter wheel in between the Focal Extender and a CCD camera, which would increase the distance to the focused image. This difference in design allows users to rest easy, whether they are pumping up the magnification of a lower power eyepiece for visual observations or using their Explore Focal Extender in imaging applications.\n\n\u003cp\u003e\u003cspan style=\"color: #ff0000;\"\u003e\u003cstrong\u003eExplore Scientific Focal Extender Highlights\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\n\u003cp\u003e\u003cb\u003eMore Magnification Choices without Sacrificing Eye Relief\u003c\/b\u003e A good Focal Extender adds some real versatility to your telescope accessory line-up. First of all, it allows you to increase the magnification of any eyepiece with the same barrel size that you already own. In other words, 3 eyepieces offer 6 magnification choices with the addition of a focal- or tele-extender. Secondly, most of the time, lower magnification eyepieces have better eye relief than higher power models. When using a Explore focal extender to increase your magnification, you get to enjoy the generous eye relief of the lower power eyepiece, and that's quite a bonus, especially for eyeglass wearers or for those with fast telescopes who can really push high magnification eyepieces. Remember, Explore Scientific manufactures focal extenders in 2X, 3X and 5x models, so there is something for every style of telescope.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eOptimized Optical Design\u003c\/b\u003e Explore Focal Extenders are optimized through each design, fabrication, and testing process to produce high contrast, high resolution images.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eDurable Coatings \u0026amp; Finishing Touches\u003c\/b\u003e Each of the four elements in your Explore Scientific Focal Extender is fully multi-coated with EMD enhanced coatings, resulting in bright, sharp images; and every element has blackened edges to reduce internal reflections and increase contrast.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eT\u003c\/b\u003e\u003cb\u003eapered Barrel for Extra Security\u003c\/b\u003e The insert barrel of each Explore Scientific extender is double-tapered to allow smooth insertion to, and removal from, a telescope's eyepiece holder, focuser or diagonal, however the wide dimension of the taper helps prevent the focal extender from falling out of the telescope should the set-screw holding it in place become loose.\u003c\/p\u003e\n\u003c!-- split --\u003e\n\u003cul class=\"toggle-tabs\"\u003e\n\u003cli\u003eIncreases an eyepieces magnification by 5 times\u003c\/li\u003e\n\u003cli\u003e1.25\" Barrel Size\u003c\/li\u003e\n\u003cli\u003eAll Explore Scientific Focal Extenders are fully multi-coated and each element has blackened edges for increased contrast and prevention of internal reflections\u003c\/li\u003e\n\u003cli\u003eEfficient four element design\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Explore Scientific","offers":[{"title":"Default Title","offer_id":44906145930,"sku":"ES-FE05-125","price":199.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1594\/4815\/products\/dd9b475353ca524f17497815d9506aa8.png?v=1553279816"},{"product_id":"takahashi-fc35-focal-reducer","title":"Takahashi FC-35 0.66x Reducer","description":"\u003cp\u003e \u003c\/p\u003e\n\u003ch3\u003eTakahashi FC-35 .66X Reducerfor FC-100DF, FS-102, and FC-100 Telescopes\u003c\/h3\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003eThe FC-35 0.66 X Reducer was designed by Takahashi Japan for a wide variety of their FC and FS series telescopes.\u003c\/p\u003e\n\u003cp\u003eThis FC-35 is compatible with the FC-100DF, FC-100, and the FS-102 when used with the \u003ca href=\"https:\/\/optcorp.com\/products\/takahashi-fc-100-camera-ring-adapter-tka23202\" target=\"_blank\" rel=\"noopener noreferrer\"\u003eCA 100 ring\u003c\/a\u003e (sold separably). A \u003ca target=\"_blank\" rel=\"noopener noreferrer\"\u003eFC-35 is also available with a CA 130 Ring\u003c\/a\u003e for use with FC-125, FC-128, and FC-152 telescopes. \u003c\/p\u003e\n\u003cp\u003eThe FC-35 will reduce the focal length of your telescope by 10%, and will provide a 44 mm diameter image circle. The metal back, as measured from the flat, rear-most shoulder of the FC-35, is 78.1 mm.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003eWith the FC-35 installed, each compatible telescope will have the following focal length and f\/ratio:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eFC-100DF: 485 mm, f\/4.9\u003c\/li\u003e\n\u003cli\u003eFC-100: 526 mm, f\/5.3\u003c\/li\u003e\n\u003cli\u003eFS-102: 542 mm, f\/5.3\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"Takahashi","offers":[{"title":"Default Title","offer_id":44908135626,"sku":"TK-TKA19580","price":1110.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1594\/4815\/products\/5e780ec8f1faebecaae79c5116f356f5.jpg?v=1553300092"},{"product_id":"planewave-0-66x-reducer-for-cdk-telescopes-with-irf90-rotating-focuser-600166","title":"Planewave 0.66x Reducer for CDK Telescopes with IRF90 Rotating Focuser","description":"\u003ch3\u003ePlanewave 0.66x Reducer for CDK Telescopes with IRF90 Rotating Focuser\u003c\/h3\u003e\u003cp\u003e\r\n\r\nThe Planewave 0.66x Reducer was created to work with flat field telescopes such as the CDK. This particular model has been designed to be used with the IRF90 rotating focuser. The 600166 CDK Reducer has a lower profile and can be used with cameras that take up more back focus.  As with any high performance telescope, this reducer is easily affected by spacing. It has very little back focus of its own and uses a significant amount of the telescope's back focus. However, if you have the appropriate camera setup, this fine accessory will reduce your CDK's focal ratio while preserving its high level performance.\r\n\r\nA crucial factor in getting the most ideal performance out of your system is the back focus between the reducer and the focal plane. Optimally, this distance should be 1.85\", but you can adjust this measurement and still receive superb performance.\r\n\r\nPlanewave Product Number: \u003cstrong\u003e600166\u003c\/strong\u003e\u003c\/p\u003e","brand":"Planewave","offers":[{"title":"Default Title","offer_id":44912245130,"sku":"PI-600166","price":1400.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1594\/4815\/products\/55adf5d4a800747e9ce47d8fca71cec7.jpg?v=1561067344"},{"product_id":"explore-scientific-3-inch-0-7x-reducer-flattener","title":"Explore Scientific 3\" Field Flattener 0.7x Focal Reducer","description":"The Explore Scientific 3\" Field Flattener 0.7x Focal Reducer is a versatile accessory made to augment your astrophotography adventure. As a field flattener, this accessory will take care of annoying edge-of-field aberrations brought about by curved focal planes, resulting in clear, sharp images. As a focal reducer, this accessory will reduce your focal ratio by 0.7 for a wider field of view and increased image illumination in shorter exposure intervals. Explore Scientific recommend this accessory for their 102mm, 115mm, 127mm, 140mm, 152mm, and 165mm triplet APO refractors. Please note that if you have a telescope with a 2.5\" focuser, you will need \u003ca href=\"https:\/\/optcorp.com\/products\/explore-scientific-adapter-fffr507x-to-hex-focuser\" title=\"Explore Scientific Adapter for FFFR507X-00 to 2.5-Inch Hex Focuser\" target=\"_blank\"\u003ethis special adapter\u003c\/a\u003e. Features fully multi-coated optics and comes with a 3-inch Nosepiece, 2 adapters for various focuser sizes and a male T-thread (M42) adapter for the camera. An additional \u003ca href=\"https:\/\/optcorp.com\/products\/explore-scientific-m48-adapter-fffr\" title=\"Explore Scientific M48x0.75 Adapter for FFFR\" target=\"_blank\"\u003eM48 camera adapter\u003c\/a\u003e is sold separately. OPT Product Number: \u003cstrong\u003eES-FFFR507X-00\u003c\/strong\u003e\u003cbr\u003e \u003c!-- split --\u003e\n\u003cul\u003e\n\u003cli\u003eReduces focal ratio to 70-percent of its standard value ( 0.7x)\u003c\/li\u003e\n\u003cli\u003eCorrects Edge-of-Field aberrations\u003c\/li\u003e\n\u003cli\u003eBarrel Size: 3-inch\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003ePlease note that \u003ca href=\"https:\/\/optcorp.com\/products\/explore-scientific-adapter-fffr507x-to-hex-focuser\" target=\"_blank\"\u003eES-510366\u003c\/a\u003e is a \u003cspan style=\"color: #ff2a00;\"\u003eREQUIRED\u003c\/span\u003e adapter for all Explore Scientific triplet refractor telescopes with 2.5\" Hex focusers.\u003c\/strong\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- split --\u003e\n\u003cul\u003e\n\u003cli\u003e3-inch .7x Focal Reducer \u0026amp; Field Flattener\u003c\/li\u003e\n\u003cli\u003e3-inch Nosepiece Adapter\u003c\/li\u003e\n\u003cli\u003e2 adapters for various focusers\u003c\/li\u003e\n\u003cli\u003eT-Thread Adapter\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Explore Scientific","offers":[{"title":"Default Title","offer_id":44915196554,"sku":"ES-FFFR507X-00","price":479.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1594\/4815\/products\/UT-11936.jpg?v=1553316664"},{"product_id":"sky-watcher-focal-reducer-corrector-for-pro-ed80-s20200","title":"Sky-Watcher 0.85x Focal Reducer \u0026 Corrector for EvoStar 80ED","description":"This 0.85x Focal Reducer \u0026amp; Corrector was made for astronomers who are serious about astro-imaging. Developed for the Sky-Watcher EvoStar 80ED (also known as the Pro ED80), this superior quality accessory facilitates edge-of-field correction that is greatly improved while effectively reducing the telescope's focal length by a factor of 0.85x.\u003c!-- split --\u003e\n\u003cul\u003e\n\u003cli\u003eReduces focal ratio by a factor of 0.85x\u003c\/li\u003e\n\u003cli\u003eFor use with Pro ED80 Telescope\u003c\/li\u003e\n\u003cli\u003eFacilitates greatly improved edge-of-field correction\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- split --\u003e\n\u003cul\u003e\n\u003cli\u003eSky-Watcher 0.85x Focal Reducer \u0026amp; Corrector for EvoStar 80ED\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Sky-Watcher","offers":[{"title":"Default Title","offer_id":44915340426,"sku":"SW-S20200","price":370.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1594\/4815\/products\/bcda2cea02822327bfc75d3fbd7e1b68.jpg?v=1553311673"},{"product_id":"stellarvue-focal-reducer-field-flattener-for-f7-refractors-with-2inch-focusers","title":"Stellarvue 0.8X Reducer Flattener for f\/7 Refractors with 2\" Focusers","description":"\u003cp style=\"text-align: left;\"\u003eThe Stellarvue SFFR102-2 Reducer Flattener is optimized for use with f\/7 refractors with a standard 2\" focuser. The SV Reducer Flattener slips into the 2\" focuser and is snugged into place with the focusers set screws. A 48 mm filter thread is machined into the reducer flattener, allowing you to add standard 2\" filters when desired. The focal reduction of the SFFR102-2 is 0.8X, which converts your f\/7 refractor to f\/5.6.\u003c\/p\u003e\n\u003cp\u003eThe backfocus of the Stellarvue 2\" Reducer Flattener for f\/7 Refractors is 55 mm. Since a DSLR with t-ring has a 55 mm backfocus, it is a simple matter to use the reducer\/flattener for DSLR imaging. Just insert the reducer\/flattener into the telescopes focuser and then thread the camera\/t-ring combo onto the flattener. An example is shown in the additional images section to the left.\u003c\/p\u003e\n\u003cp\u003eIf you will be imaging with a CCD camera as opposed to a DSLR, extension tubes may be required to achieve focus. It is important that you know the distance between your cameras t-thread and the sensor, and it is equally important to remember that the distance from the back of the field flattener\/reducer to the CCD sensor remains at 55 mm. If the CCD camera, for instance has a backfocus of only 35 mm, a 20 mm extension will be needed. If any extension tubes are required for your set-up, they will thread between the camera and the field flattener, as shown in the example provided in additional images. Please note that the camera side of the reducer\/flattener requires extension rings with a standard t-thread (M42x.75).\u003c\/p\u003e\n\u003c!-- split --\u003e\n\u003cul\u003e\n\u003cli\u003ePer the manufacturer, this item is backordered until further notice.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Stellarvue","offers":[{"title":"Default Title","offer_id":44917083978,"sku":"SV-SFFR102-2","price":195.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1594\/4815\/products\/3adb9675677bdff46eb74a7361586e45.jpg?v=1500478685"},{"product_id":"stellarvue-focal-reducer-field-flattener-for-svr102t-telescope-with-2pt5-focusers","title":"Stellarvue 0.8X Reducer Flattener for SVR102T with 2.5\" Focuser","description":"\u003cp\u003e\u003cspan style=\"color: #000000;\"\u003e\u003cstrong\u003eThe 0.8X Reducer Field Flattener for the SVR102T with 2.5-Inch Focuser by Stellarvue:\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"color: #000000;\"\u003e\u003cstrong\u003eThe Stellarvue SFFR102-25 Reducer Flattener\u003c\/strong\u003e\u003c\/span\u003e is optimized for use with the SVR102T that sports either an SV 2.5-inch focuser or a 2.5-inch Feather Touch focuser.\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"color: #000000;\"\u003e\u003cstrong\u003eThe SV Reducer Flattener\u003c\/strong\u003e\u003c\/span\u003e threads into the 2.5-inch focuser. A 48 mm filter thread is machined into the reducer flattener, allowing you to add standard 2-inch filters when desired.\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"color: #000000;\"\u003e\u003cstrong\u003eThe focal reduction\u003c\/strong\u003e\u003c\/span\u003e of the SFFR102-25 is 0.8X, which converts your SVR102T to f\/5.6.\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"color: #000000;\"\u003e\u003cstrong\u003eThe backfocus\u003c\/strong\u003e\u003c\/span\u003e of the Stellarvue 2.5-inch Reducer Flattener is 55 mm. Since a DSLR with a T-ring has a 55 mm backfocus, it is a simple matter to use the reducer\/flattener for DSLR imaging. Just insert the reducer\/flattener into the SVR102T focuser and then thread the camera\/t-ring combo onto the flattener. An example is shown in the additional images section to the left.\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"color: #000000;\"\u003e\u003cstrong\u003eIf you will be imaging\u003c\/strong\u003e\u003c\/span\u003e with a CCD camera as opposed to a DSLR, extension tubes may be required to achieve focus. It is important that you know the distance between your camera's T-thread and the sensor, and it is equally important to remember that the distance from the back of the field flattener\/reducer to the CCD sensor remains at 55 mm. If the CCD camera, for instance has a backfocus of only 35 mm, a 20 mm extension will be needed. If any extension tubes are required for your set-up, they will thread between the camera and the field flattener, as shown in the example provided in additional images. Please note that the camera side of the reducer\/flattener requires extension rings with a standard T-thread (M42x.75).\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003eOPT Product Number:\u003cspan style=\"color: #000000;\"\u003e\u003cstrong\u003e SV-SFFR102-25\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e","brand":"Stellarvue","offers":[{"title":"Default Title","offer_id":44917090634,"sku":"SV-SFFR102-25","price":229.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1594\/4815\/products\/f4ac3eb72f1c09baed6b3ae9d3307f6e_9541d196-d9e5-43e2-9167-dd57281e0f38.jpg?v=1561068656"},{"product_id":"skywatcher-quattro-coma-corrector-s20204","title":"Sky-Watcher Quattro Coma Corrector","description":"\u003cp\u003eThis Sky-Watcher Quattro Coma Corrector is an optical accessory you will appreciate if you wish to do astroimaging with your f\/4 Quattro imaging Newtonian scope. All classical Newtonian telescopes suffer from some coma problems because they have only a single parabolic mirror which does all of the ray focusing work! This is fundamental to the optical principles involved.\u003c\/p\u003e\n\u003cp\u003eComa is an optical aberration which is usually observed in off-axis images formed by a telescope with a parabolic focusing system. Stars located off-axis or near the edges of the field seem to have a comet-like appearance instead of being round. Astronomers who do mainly visual observing can usually overlook some coma in their field. But when you do astroimaging with your equipment, coma will become a nuisance rather quickly as you expect your stellar images to appear round or pointed. For best results with your f\/4 Quattro Imaging Newtonian scope, use the Sky-Watcher Quattro Coma Corrector to completely eliminate that annoying coma aberration.\u003c\/p\u003e\n\u003cp\u003eThis Quattro coma corrector by Sky-Watcher is made with FPL51 and Schott glass and therefore features extra low dispersion imaging performance. The use of the Quattro Coma Corrector requires 55 mm of back focus and an image cone with an f\/4 focal ratio because of its inherent design. Sky-Watcher makes Canon EOS and Nikon DSLR adapters for this purpose, and these can be obtained from OPT.\u003c\/p\u003e\n\u003c!-- split --\u003e\n\u003cul\u003e\n\u003cli\u003eMade for use with f\/4 Quattro Newtonians\u003c\/li\u003e\n\u003cli\u003eMade with FPL51 and Schott glass for Extra Low Dispersion performance\u003c\/li\u003e\n\u003cli\u003eThe Quattro Coma Corrector requires 55 mm backfocus distance\u003c\/li\u003e\n\u003cli\u003eCan be used with optional Sky-Watcher Canon and Nikon DSLR adapters\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- split --\u003e\n\u003cul\u003e\n\u003cli\u003eSky-Watcher Quattro Coma Corrector\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Sky-Watcher","offers":[{"title":"Default Title","offer_id":44925686986,"sku":"SW-S20204","price":490.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1594\/4815\/products\/s20204_quattrocomacorrector_1800x1800_4c644690-e1e9-4d08-9a00-b08fb58b1747.jpg?v=1597852821"},{"product_id":"takahashi-645-0-7x-reducer-for-fsq-130ed","title":"Takahashi 645 0.7x Reducer for FSQ-130ED","description":"\u003cp\u003eThe Takahashi 645 Reducer 0.7X reduces the focal length of the FSQ-130ED telescope by 0.7X, increasing the speed of the optical system for astrophotography.  The reducer prodces a 70 mm diameter image circle that is ideal for larger imaging chips.\u003c\/p\u003e\n\u003c!-- split --\u003e\n\u003cul\u003e\n\u003cli\u003eReduces the focal length of the FSQ-130ED telescope by 0.7X\u003c\/li\u003e\n\u003cli\u003eProduces a 70 mm diameter image circle that is ideal for larger imaging chips\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- split --\u003e\n\u003cul\u003e\n\u003cli\u003eTakahashi 645 0.7x Reducer for FSQ-130ED\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Takahashi","offers":[{"title":"Default Title","offer_id":44925803786,"sku":"TK-TKA38580","price":2970.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1594\/4815\/products\/TKA38580.jpg?v=1603825089"},{"product_id":"zwo-1-25-atmospheric-dispersion-corrector-adc","title":"ZWO 1.25\" Atmospheric Dispersion Corrector","description":"\u003cp\u003e\u003cstrong\u003eThe 1.25-inch Atmospheric Dispersion Corrector\u003c\/strong\u003e, or ADC with Bubble Level from ZWO, is a brilliant tool for correcting the scattering effect of light rays in the Earth's atmosphere. \u003cstrong\u003eExperience Fringe-free Observation\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe ADC allows you to view and image bright objects clear of distortions and aberrations. You no longer have to wait for a target to be high enough in the sky for it to be satisfactory to view. With the ADC you can now view objects with perfect clarity no matter their location. \u003cstrong\u003eZWO ADC Operation\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe ADC corrects the atmosphere's dispersion effect on planets, stars, and other bright objects by using the chromatic cover of two opposing rotating prisms. Levers on the ADC, when separated by 180 degrees, adjust the two rotating prisms and change the compensation effect from nothing to its apex. The attached bubble level helps line this all up!\u003c\/p\u003e\n\u003cp\u003eThe atmosphere's dispersion effect influences some wavelengths differently than others. Adjusting the ADC's levers provides a simple way to compensate for this.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eImaging\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eColor imaging a planet without an ADC will inevitably result in color fringing and distortion. When the presence of this fringing and distortion is taken away in processing, you wind up with an image with a decreased resolution that cannot be reclaimed. While Mono imaging separates Red, Green, and Blue images, superimposing them helps offset this to some extent. To take advantage of an image's full resolution, a Luminance image should be taken. Use the ZWO ADC, which removes distortions and image shift issues, resulting in an image with more detail. Finally, further processing can produce a complete enhanced final image.\u003c\/p\u003e\n\u003cp\u003eOPT Product Number: \u003cstrong\u003eZWO-\u003c\/strong\u003e\u003cb\u003e\u003cspan style=\"color: #000000;\"\u003eADC\u003c\/span\u003e\u003c\/b\u003e\u003c\/p\u003e\n\u003c!-- split --\u003e\n\u003cul\u003e\n\u003cli\u003eTwo 1.25-inch Adapters Included! Both female T2 Thread.\u003c\/li\u003e\n\u003cli\u003eBackfocus: The body measures 30 mm.\u003c\/li\u003e\n\u003cli\u003eCorrects Color Separation due to Atmospheric Conditions!\u003c\/li\u003e\n\u003cli\u003eBubble Level.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- split --\u003e\n\u003cp\u003eIncluded:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e1.25-inch Atmospheric Dispersion Corrector.\u003c\/li\u003e\n\u003cli\u003e1.25-inch Adapter with Female T2 Thread X2.\u003c\/li\u003e\n\u003cli\u003eAttached Bubble Level.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"ZWO","offers":[{"title":"Default Title","offer_id":44931289738,"sku":"ZWO-ADC","price":128.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1594\/4815\/products\/ADC1.jpg?v=1619211484"},{"product_id":"takahashi-0-6x-f-3-0-reducer-for-fsq-106ed-xiii-x4","title":"Takahashi 0.6x F\/3.0 Reducer for FSQ-106ED","description":"\u003cp\u003e\u003cspan style=\"color: #000000;\"\u003e\u003cstrong\u003eThe 0.6x F\/3.0 Reducer for FSQ-106ED by Takahashi:\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003eThis splendid quality reducer allows you transform your F\/5 FSQ-106 ED or FSQ-130 ED telescope into an incredibly fast F\/3.0 configuration.\u003c\/p\u003e\n\u003cp\u003eThe high refractive index and low dispersion glass used in this reducer effectively suppresses lateral chromatic aberration and coma, further enhancing your viewing or imaging experience! \u003c\/p\u003e\n\u003cp\u003eOPT Product Number: \u003cspan style=\"color: #000000;\"\u003e\u003cstrong\u003eTK-TKA38581\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"Takahashi","offers":[{"title":"Default Title","offer_id":44931350218,"sku":"TK-TKA38581","price":1990.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1594\/4815\/products\/69d480e6120bdc8a138b9a65866e9d71.jpg?v=1553306217"},{"product_id":"stellarvue-reducer-flattener-for-sv70t","title":"Stellarvue Reducer\/Flattener for SV70T","description":"\u003cp\u003eThis is a Reducer\/Flattener that has been optimized for Stellarvue's 70mm Triplet Lens. It threads smoothly into a Stellarvue 2.5\" A version focuser, and will also slide into the 2\" focuser for earlier model SV70ED's. 0.8X focal reduction converts the 70 mm f-6 to a 336 mm f-4.8- Stellarvue's widest field refractor to date!  This reducer\/flattener has a standard 48 mm filter thread, and standard 2\" filters can be added to the reducer flattener when imaging. The adapter takes camera's with a 42mm thread on that end of the link. The backfocus of the unit is 55 mm with the included 11 mm extension tube- but remove this tube and the backfocus increases to 66 mm. Since a DSLR with t-ring has a 55 mm backfocus, thread the SFFR-70APO and extension tube into the cameras t-ring, then screw it to the focuser as shown in the images above.  If you are using a CCD camera, an additional set of extension tubes may be needed depending on the backfocus of the camera. You need to know how much distance there is between the cameras T-thread and the ccd chip, as it is important that the distance from the back of the field flattener to the chip be maintained at 55 mm (66 mm without the supplied extension). So if the CCD camera has a backfocus of only 35 mm, the supplied 11 mm extension and an additional 20 mm extension will be needed. See the example above.  SV-SFFR-70APO\u003c\/p\u003e","brand":"Stellarvue","offers":[{"title":"Default Title","offer_id":44933000842,"sku":"SV-SFFR-70APO","price":269.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1594\/4815\/products\/6e956abdbb272cad0f43ea0240417566.jpg?v=1561065581"},{"product_id":"takahashi-fsq-106-645-qe-reducer-set-for-fsq-106ed","title":"Takahashi 645 QE Reducer Set for FSQ-106ED","description":"\n\u003ch3\u003eTakahashi 645 QE Reducer Set for FSQ-106ED\u003c\/h3\u003e\n\n Takahashi's potent large 645 QE reducer is a highly useful piece of equipment. This reducer uses four lenses in four groups to produce a large ??60mm image circle suitable for large chip CCD cameras. Each lens is individually of a high quality, and together they produce remarkable results. The reduction factor is 0.73x which produces f\/3.6 380mm with the FSQ-106ED. The result is a sharp image across the entire image circle. In order to give maximum rigidity to the reducer, the reducer screws into the rear cell of the FSQ.  Manufacturer Product Number: \u003cstrong\u003eTKA31580LS\u003c\/strong\u003e","brand":"Takahashi","offers":[{"title":"Default Title","offer_id":44935236170,"sku":"TK-TKA36580L","price":2860.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1594\/4815\/products\/49a55107ec0001f64b37ced4f90f7dc2_c763d7f0-e314-496c-8afe-3f73572217a1.jpg?v=1553306356"},{"product_id":"astro-physics-2-7-photo-visual-telecompressor-0-75x","title":"Astro-Physics 2.7\" Photo-Visual Telecompressor 0.75X","description":"\u003cp\u003eAstro-Physics has produced a splendidly high quality focal reducer that is very effective and adaptable. They have increased the versatility of their focal reducer (also called a Telecompressor) by designing a variety of accessories for photographic, CCD and visual applications. Installing this focal reducer to your focuser will alter the focal length to approximately 0.75 of its original value. As an example, an f\/6 instrument would be altered to a very fast f\/4.5.  This alteration makes it possible to capture deep sky objects on film in a fraction of the time required at prime focus. In addition, you can more effectively capture a large object or cluster of objects with the telecompressor. For instance, if you photograph at prime focus with a 35 mm camera on a 130 mm f\/6 StarFire, you will achieve a 1.7 x 2.4 degree field. If you use the telecompressor, the field size increases to 2.3 x 3.3 degrees at f\/4.5. This greatly increases the versatility of your refractor for imaging a wide variety of objects.  The accessory lens is well corrected so as to preserve the high contrast and superb color correction of the main objective, sacrificing none of the quality of whatever you've chosen to install your Telecompressor onto. While the telecompressor flattens the field to a certain degree, you may still notice some slightly elongated stars in the corners. This is less of an issue with CCD imaging when the chip size is smaller than a 35 mm negative.  The Telecompressor was designed to thread directly into the drawtube so as to place the optics forwards in the optical system. As a result of this design choice, the telecompressor can only be used with Astro-Physics 2.7-inch and 4-inch focusers and Starlight Instruments 3-inch and 3.5-inch focusers that have an end-cap adapter for Astro-Physics 2.7-inch accessories.  Information on how to calculate the compression factor and coverage for your particular setup (along with connection options adapter drawings in their links):  See \u003ca href=\"http:\/\/www.astro-physics.com\/tech_support\/accessories\/photo\/Telecompresssor-techdata.pdf\" target=\"_blank\" rel=\"noopener noreferrer\"\u003eHere\u003c\/a\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eMagnification\/ Telescompression Graph:  \u003c\/span\u003eSee \u003ca href=\"http:\/\/www.astro-physics.com\/products\/accessories\/photo_acc\/CCDT67%20\u0026amp;%2027TVPH.pdf\" target=\"_blank\" rel=\"noopener noreferrer\"\u003eHere\u003c\/a\u003e \u003c\/p\u003e\n\u003cp\u003e Manufacturer Product Number: \u003cstrong\u003e27TVPH\u003c\/strong\u003e\u003c\/p\u003e","brand":"Astro-Physics","offers":[{"title":"Default Title","offer_id":44935293962,"sku":"AP-27TVPH","price":285.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1594\/4815\/products\/ecdffc02dd01690d5675d5b10608b8cf.jpg?v=1553288889"},{"product_id":"takahashi-extender-q-1-6x","title":"Takahashi Extender-Q 1.6x","description":"\u003cp\u003eThe Takahashi Extender-Q 1.6X works with the FS and FC series telescopes. It extends the focal length of these telescopes by 1.6X and has back focus of 157mm. This extender also comes with the necessary spacers to attach to a Takahashi WideT-Ring (M54x.75) with a back focus of 56mm.\u003c\/p\u003e","brand":"Takahashi","offers":[{"title":"Default Title","offer_id":536320966666,"sku":"TK-TKA00595","price":640.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1594\/4815\/products\/Takahashi--Extender-Q-1-6x-TK-TKA00595.jpg?v=1507839042"},{"product_id":"takahashi-fsq-85edx-flattener","title":"Takahashi FSQ-85EDX Flattener","description":"\u003cp\u003eThe FSQ-85EDX was designed to be used with cameras that have APS-C sized or smaller sensors. The Takahashi FSQ-85EDX Flattener expands the corrected image circle from 28mm diameter to a 44mm diameter to fully cover any full frame sensor size.\u003c\/p\u003e","brand":"Takahashi","offers":[{"title":"Default Title","offer_id":855766204426,"sku":"TK-TKA37582","price":328.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1594\/4815\/products\/Takahashi-FSQ-85EDX-Flattener-Image-Not-Avalilable.jpg?v=1553306731"}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1594\/4815\/collections\/Barlows_Reducers_Correctors.jpg?v=1561136424","url":"https:\/\/optcorp.com\/collections\/barlows-and-correctors-and-reducers\/100-500.oembed","provider":"OPT Telescopes","version":"1.0","type":"link"}