Takahashi Telescope Sky 90II - 3.5" f/5.6 Fluorite APO Refractor OTA $2,400.00,  Takahashi TSK9001,Optical Tubes (OTA) Telescopes, Top Rated
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Takahashi Telescope Sky 90II - 3.5

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Takahashi Refractor OTA SKY-90 F/5.6 500MM F.L. Fluorite Doublet Telescope, TSK9001

Item No. 611-50051
Manuf. No. Takahashi TSK9001

Takahashi Sky 90II - 3.5" f/5.6 Fluorite APO Refractor OTA, TSK9001

The Takahashi Sky 90 is a refractor telescope par excellence - created for the optical connoisseur. It begins with a combination of calcium fluorite crystal lens which are created in a laboratory environment, then vacuum hard coated for maximum light transmission. From there it's combined with low dispersion glass to offer up optical quality that surpasses any other extra-low dispersion glass refractor on today's market. Thanks to Takahashi's controlled environment in flourite crystal creation, absolutely precision can be achieved that cannot be rivaled by nature... And this precision shows in Takahashi's true apochromatic optical systems - and their virtually perfect color correction!

But perfection doesn't stop there. Unlike a triplet system, Takahashi stops at a two-element air spaced design - eliminating an extra light robbing lens and virtually stopping any possibility of oil spacing becoming corrupt with age. To allow for precision tuning, lens collimation can also be adjusted by applying an optional Cheshire eyepiece and adjusting the twelve locking collimating screws located on the primary lens cell assembly. The Takahashi Sky 90 body itself is constructed from lightweight, durable, powder-coated aluminum with an outer diameter of 95mm. It includes an generous 2.5" rack and pinion focuser included with compression fitting 1.25" adapter and 2" adapter with secure thumbscrews. The focuser itself is high quality, offering smooth performance and the capability of supporting heavy accessories with ease.

One of the most beautiful parts of the Sky 90's construction is its portability... With the built-in lens shade retracted and focuser fully in, it measures only 13.8" and weighs only 7 pounds. That's easily stored in an optional hard case and even easier considered as "carry on" airline luggage. Even with everything fully extended it still only measures about 19"! The latest Takahashi Sky 90 II NSV (New Short Version) telescope model is a truly portable design. The 90mm (3-1/2") f/5.56 fluorite doublet apochromatic optical system is of outstanding quality. Not only is this instrument an excellent choice for astronomy, it can be used as a portable high-quality telescope for birding, and accepts the FS series photographic adapters. What's more, simply add an optional 5-element Extender-Q and you can increase the focal ratio to f/8.9 for flat field lunar and planetary photography... or increase your range for high magnification work when using the Takahashi Sky 90 visually. There's also a mounting block on the focuser cell provided for the optional finderscope and bracket.

With a limiting visual magnitude of 11.5 and a sweet 1.3 arc seconds of resolution, this 500mm focal length telescope will offer up to 178x of practical magnification - fulfilling all your refractor needs. Why settle for anything less than optical perfection?


  • 90mm air-Spaced doublet offers true f/5.56 apochromatic refractor design.
  • The Takahashi Sky 90 II incorporates precision manufactured laboratory flourite elements, combined with low dispersion glass.
  • Vacuumed hardcoated on all surfaces and internal knife-edge baffling for maximum contrast.
  • The Takahashi Sky 90 II provides a 5.1 degree field of view on the long axis of 35mm photos.
  • Ultimately portable at only 7 pounds in weight and 13.8" in length.
  • The Takahashi Sky 90 II includes 2" rack and pinion focuser, adapters, finderscope block and retractable dewshield.
  • Five Year Manufacturer Warranty.

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