Takahashi Mewlon 210 Dall-Kirkham Telescope OTA
The Takahashi Mewlon Dall-Kirkham Telescope
The Takahashi Mewlon employs an ellipsoidal figure on the primary mirror and a spherical figure on the secondary. By focusing on very tight tolerances for these surfaces, Takahashi is able to deliver a compact telescope with reasonable aperture and high resolution. Where fast F/ratios are not required, the F/12 Mewlons provide excellent contrast by utilizing a smaller secondary mirror than comparable Cassegrain designs. Secondary obstruction as a percentage of diameter is 29-31% on the Mewlons. Classical Cassegrain telescopes usually have secondary obstruction of 32% or greater. Commercial Schmidt-Cassegrains have secondary obstructions of approximately 38% for F/10 systems. Ritchey-Chretien Cassegrains have even more secondary obstruction making them less suitable for visual, high contrast applications.
Takahashi uses extensive knife-edge baffling to minimize stray reflections as well as a specially designed tube that also acts as a light baffle. The result is an instrument that rivals an excellent long-focus Newtonian or refractor for contrast and sharpness. Some opticians have criticized the Dall-Kirkham design as having unacceptable coma. With most eyepieces (including Panoptics and Naglers) the coma is negligible and well outside the field of view. Stars are much smaller and sharper than in commercial Schmidt-Cassegrains. Coma may be a problem for wide-field astro-imaging, but these instruments were not designed for such tasks. With Takahashi's field flattener/reducer, these instruments offer superb off-axis images at F/9.
Takahashi produces precision optical surfaces capable of delivering an airy disc of 20. Because the Mewlon primary mirror is larger than the effective aperture, its cell installation engineering helps to eliminate mirror stress which can cause astigmatism. The focuser mechanism has also been carefully designed to reduce shifting and maintain consistency. Both the Mewlon 250mm and 300mm models come standard a secondary mirror translating focuser that's accomplished with the electronic hand controller. With a wide range of both visual and photographic accessories available to the Takahashi Mewlon series, there is no reason why you shouldn't be able to achieve any astronomy project you have in mind using this fine telescope.
The 250mm and 300mm Takahashi Mewlon electronic focusing is accomplished by moving the secondary mirror. This eliminates the image-shift problem inherent to commercial Schmidt-Cassegrains with moving primary mirrors. Because of the loose tolerances required in moving large and heavy mirrors on a baffle tube, most SCT's will not maintain perfect collimation. Image quality is then compromised in such optical systems. The large Mewlons also have removable covers for their primary mirror cells, this facilitates rapid mirror cooling so that the observer can take advantage of favorable seeing conditions more quickly. These features make the large Mewlons ideal for high-resolution CCD imagery.
With the Mewlon series, it isn't necessary to sacrifice optical performance for ease of use and portability. When it comes time to place your Takahashi Mewlon telescope on a mount, it's as easy as simply connecting the dovetail plates. The high quality finderscope not only lends itself to the packages as an excellent instrument for alignment, but is also designed as a convenient "grab handle" to assist in mounting and transport. It's rigid construction means help in handling the optical tube without fear of bending or breaking. On larger models, the Mewlon also includes a counterweight against the body to help balance the optical tube. Just these small considerations in Takahashi's Mewlon design mean quality in engineering that sets it apart.
The 8.3" Mewlon 210 weighs just 18lbs (8.2kg) with a 7x50 finder attached. The Mewlon 250 weighs only 28lbs (12.7kg) and is remarkably compact for a 10" Cassegrain. Both of these instruments are highly portable and offer deep sky views that are exceptional. On the planets, many observers have reported seeing details they thought impossible with telescopes of this aperture. With the exception of a few diffraction spikes around bright stars, on might believe they were observing with a large apochromatic refractor. The advantage, though, is a greater amount of light grasp and resolution than a comparably priced refractor. Indeed, the Mewlons offer an exceptional value in their aperture class.
Takahashi Mewlon 210 Dall-Kirkham Telescope
Takahashi Product Number: TLK2101
Important Note: Takahashi America requires that their telescope optical tube assemblies be shipped via 2nd Day Air or faster in order for the full warranty to be in force. Please make sure you choose the appropriate shipping method in your shopping cart or, if you speak to an OPT associate, request 2nd Day Air or faster. If you are purchasing a telescope and mount package or any accessories to accompany an OTA, please contact OPT for a shipping quote, since only the OTA is required to ship second day air but all other products can be shipped separately via any other available shipping method. Thank you!
Aperture211 mm (8.3")
Dew Shield IncludedNo Not Necessary
Diagonal Included Sold Separately
Exterior ColorGloss White
Hand Controller includedNo
Highest Useful Magnification500x
Image Across Field1
Limiting Stellar Magnitude13.4
Mount Type OTA Only
OTA Outer Diameter9.6"
OTA Weight17.6 lb.
Power Adapter Included Does Not Require Power
Telescope SeriesTakahashi Mewlon
Tripod Type Included Sold Separately
Warranty5 Year Warranty