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Explore Scientific 127mm f/6.5 Achromatic Refractor with Accessories

SKU : ES-DAR127065-01

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  • Aperture: 127mm (5")
  • Focal Ratio: f/6.5
  • Focal Length: 863mm
  • Excellent value visual astronomy instrument

Product Details

  • The classic air-spaced, crown-and-flint, doublet achromatic refractor is reborn with the aim to produce superior-class optical figure in a short (f/6.5) focal length design with Explore Scientific Air-Spaced Doublet AR Series. These optics are an extreme value, produce stunning images of deep sky objects, double stars, planets, and the moon that are a small fraction of the price of comparable aperture apochromat refractors. Finally one can own a diffraction-limited high quality refractor for a relatively modest investment.  

    Designed to handle the rigors of public star parties and educational outreach, the Explore Scientific AR Series has standard hardware which includes a precision 10:1 two-speed focuser, a 2-inch diagonal, and an 8x50 finder scope. You can be confident that the quality and construction of these telescopes will allow heavy use for many years and are backed with a Lifetime Warranty.

    It's All About the Optics

    The optics in their collimatable lens cell are fully multi-coated to eliminate light scatter and maintain image contrast. We precision collimate every Explore Scientific telescope at our factory to give optimum performance. Although you may never need to adjust optical alignment, the AR Series allows for collimating the lens set should the telescope ever require it.

    Contrast is further enhanced with multiple baffles that mask and deflect unwanted stray light.

    Deluxe 10:1 Two-Speed Focuser

    The Explore Scientific Air-Spaced Doublet AR Series telescopes include a precision 2-inch ten-to-one, two-speed as standard equipment. The eyepiece holder uses a compression ring to prevent the eyepiece or camera barrel from scoring.

    On those pristine nights of steady seeing, Saturn's Rings can forever affect the hearts and minds of almost anyone who lays eyes on them. It's nights like these that astronomers like to set up their refractors and push the magnification to the limits, not only to see the magnificence of the planet at greater scale but to really test the optical and mechanical quality of the telescope.

    Many telescopes are only supplied with a standard single-speed focuser, you will find that a tiny nudge will throw out focus and turn your night into one of frustration. So we included as standard equipment, on all Explore Scientific AR Series, a ten-to-one, two-speed Crayford-style precision focuser with tension adjustment and lock to obtain and hold perfect focus. We think you'll agree that such precision is worth it.

    Universal Mounting Plate

    The Universal Adjustable Mounting Plate of the AR 127 fits on many popular equatorial and Altaz mounts, including mounts supplied by Explore Scientific, Vixen, and Meade LXD55/75.

    Instead of using a cast metal part, Explore Scientific's Universal Mounting Plate is made from extruded aluminum for added strength, it is after all what secures your telescope to the mount. We also include adjustment screws and locking bolts to allow adjustments to position the angle of the telescope when it is placed on its mount, an important feature when using an equatorial mount.

    2" 99% Reflectivity Diagonal Mirror

    The Two Inch Dielectric Diagonal includes a 1.25" eyepiece holder adapter. The purpose of a diagonal is to securely hold your eyepiece and to give you a comfortable viewing angle.

    Provided as standard equipment, Explore Scientific's Two Inch Diagonal incorporates a light-weight, one-piece diagonal body that securely cradles the precision polished diagonal flat mirror, insuring precision alignment.

    8x50 Finder Scope

    The Explore Scientific 8x50 Finder Scope provides a true field of view of 6 degrees. Its coated optics provide a bright high-resolution image so that many faint stars and nebulosity can be detected for precise aiming.

    The front objective can be custom focused to provide a sharp image every time.

    OPT Product Number: ES-DAR127065-01
  • specifications

    Aperture127 mm (5")
    Dew Shield IncludedYes
    Diagonal Included 2" Star Diagonal
    Exterior ColorGloss White
    Focal Length826 mm
    Focal Ratiof/6.5
    Limiting Stellar Magnitude13
    Optical DesignDoublet Refractor
    OTA Length863mm
    OTA Outer Diameter130mm
    WarrantyLifetime Warranty
  • included items

    • ES 127mm Achromatic Refractor OTA
    • 8x50 Finder Scope
    • 2" Diagonal
    • Universal Adjustable Mounting Plate
    • 2" Dual Speed Focuser

Product Reviews

Customer Reviews
4.7 Based on 6 Reviews
5 ★
4 ★
3 ★
2 ★
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Filter Reviews:
    United States United States

    Just received the scope

    I am quite happy with the purchase. My intention for this scope is to be my Solar and Moon visual viewing scope. And, for public outreach as I grow into my local club. However like everyone else I am waiting on my mount. So I am unable to say anything more about the scope optically. Other than it is impressive and slick looking to the expectations of, "What people think of about a telescope." It is going to serve me well. Only notably issue at this stage, "Is the scope arrived missing the lens eyepiece cover for the finder scope." Please consider this review as notice to rectify the issue. On second thought it is so minor of an issue since any number of solutions exist in my tool bag. Sincerely, mtk

    Sharon L.
    United States United States

    ES at127

    I love it. Most of the CA Is easy to deal with. Very crisp images. More than I expected out of an achromat

    Bruce S.
    United States

    So far So Good

    Have not had the occasion to use it ye.

    edwin s.

    Great 5 inch Refractor!

    my main use of this scope is for wide field viewing and low to mid power use. its not great for resolving smaller dso's. but still a great scope to image with deep sky camera. i recommend it to anyone.


    ES 127mm Achromat

    This telescope was an upgrade from a Celestron 102, which was a nice refractor as well. After a few years of using it, I was looking for a more hybrid refractor (and a goto mount that would allow me to view deep sky objects as well as still enjoy good detail on the planets. I have used this scope on about 15 occasions over 4 months and it was everything I was looking for. The 127mm lens collects plenty of light and provides extremely bright sharp images. I use a variety of different brands of eyepieces (Orion, Celestron, Meade, TMB Planetary and they all serve up very sharp images with this scope. The two-speed focuser was a nice upgrade from my other refractor and it also comes with a very nice 2 star diagonal with 1.25 adapter (every bit as good as the 2 star diagonal I had purchased separately for my other scope. Even better is the sturdy storage/carry case that comes with it - which makes it easy for transport and storing. The 8x50 spotting scope is very nice and has an adjustable focus. I have spent time viewing Jupiter, the Moon, galaxies, double stars, star clusters and a few nebula (my first view of the ring nebula. I have been particularly impressed with the sharpness while viewing star clusters and double stars. Having decent eyepieces helps too, I'm sure, but even the cheaper eyepieces I have are great to use with this scope. I've pushed this with a nice 3mm eyepiece that I have and although the views seem better (sharper with a 4mm at 206x, the image is acceptable with the 3mm on a perfectly clear night. There is of course some minor chromatic aberration that's noticeable on the edges of bright objects (such as Jupiter when it was at opposition but, this is an achromat and it does a pretty good job of keeping it to a minimum. I only seem to notice when I'm intentionally looking for the aberration on the edge of a bright object (which is not very often that I'm thinking about this. I'm using the ES AR127 on an Orion SkyView Pro mount and it's a great combination. I would highly recommend this scope and would definitely consider buying other products from Explore Scientific. I'll definitely keep this one for a looong time. Bottom line - this telescope is awesome

    Mark C.

    ES AR127

    I got this telescope as an upgrade from a nice 4 achro I had (now at my daughters' school. Boy, am I glad I got it. First light was with M35 and the first view at 27X was close to what it looked like in my 4 at 110X. When I took it up to 103X, the cluster was nicely framed with gobs of ice cold points of light. Recently, I took it up to 206X on this complex and got a nice view of nearby Cluster NGC 2158. Other deep sky objects have been very pleasing to observe in this scope. I've gotten nice clear first time views of M1, M51, the Eskimo Nebula, and much more. M13, M3, M5 and M15 at 206X show inidivual stars winking in and out all across the faces like Christmas tree lights. M11 is drop dead gorgeous at 206X. Although this telescope is probably better for viewing deep sky objects for which chromatic aberration in general, it does a fair job on other targets. Chromatic aberration is noticeable on Jupiter (I didn't get a good look at Mars with it and I don't observe Venus. But with prolonged observation, I can pick out a good bit of the festoon detail with it. Saturn is better. It really serves up nice images of lunar detail with false color only being discernible to me when I'm looking at the rim of the moon. The best suprise for me though is being able to observe a fair number of deep sky objects with the AR 127 at very high power (206X and picking out and drawing a lot of detail from the crisp images served up. The only issue with my particular telescope is that it came with a focuser that was loosey-goosey, tending to slide out when the scope was pointed close to Zenith and with Ultima and Hyperion eyepieces in it (boy these things are the size of small coke cans!!. In a few calls, the good people at OPT and Explore Scientific were able to coach me through tightening it. That's the only reason for giving this scope 4.5 stars. Otherwise, I'd given it a 5 (or 6 if I could LOL.