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Optical Tube Assemblies

Optical tube assemblies, commonly abbreviated by astronomers as OTAs are simply the tube of the telescope where the optics are internally located. OTAs can be helpful in a situation in which an observer has a compatible mount and doesn't want to buy a whole new telescope with a mount included. Optical Tube Assemblies can come in the form of Maksutov-Cassegrain, Astrographs, Reflectors, Refractors, Schmidt-Cassegrains and many others! With the right mounting connections and range of mount and tripod payload, OTAs are a great choice for changing optical type without changing the mount.

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  1. Celestron - 80ED Refractor Optical Tube Assembly

    Celestron - 80ED Refractor Optical Tube Assembly

    The pinnacle of our ED scopes, this refractor is packed with great features and excellent optics. The refractor style 80ED (APO) features a 2" rack and pinion focuser and has a bracket that can adapt to a photo tripod or attach to Celestron's Advanced GT equatorial mount.

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    (48 States)
    Model#: CEL-52280
    $450.00

  2. Celestron - C5 5" Spotting Scope

    Celestron - C5 5" Spotting Scope

    Celestron's C5 Spotting Scope is a 5" (127mm) aperture, 1250 mm f/10 Schmidt-Cassegrain optical system. Its optical excellence is the reason it was chosen by NASA for many space shuttle missions.

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    (48 States)
    Model#: CEL-52291

    Regular Price: $549.95

    Special Price: $538.95

  3. Celestron - C6-A-XLT (CG-5) 6" Optical Tube Assembly

    Celestron - C6-A-XLT (CG-5) 6" Optical Tube Assembly

    6" Schmidt-Cassegrain Optical Tube Assembly, Fastar Capable, Aluminum Optical Tube, Celestron's premium StarBright XLT coatings

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    (48 States)
    Model#: CEL-91010-XLT
    $479.95

  4. Explore Scientific AR127 f/6.5 Air-Spaced Doublet Achromat Refractor

    Explore Scientific - AR127 f/6.5 Air-Spaced Doublet Achromat Refractor

    AR127 f/6.5 Air-Spaced Doublet with EMD Coatings; Deluxe Two-Speed 2-inch Crayford Focuser; Cradle Rings with Handle and Vixen-Style Dovetail Mount; 8x50 Straight Finderscope; Enhanced 99% Reflective 2-inch Diagonal with 1.25-inch Adapter

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    (48 States)
    Model#: DAR127065-01
    Explore Scientific Fireworks All Month Long Sale (ends July 31, 2016)!

    Regular Price: $599.99

    Special Price: $524.99

  5. Lunt Engineering 70mm ED Doublet OTA

    Lunt Engineering - 70mm ED Doublet OTA

    A new optical tube by Lunt, the 70mm ED Doublet!

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    Model#: LE70OTA
    $399.00

  6. Lunt Engineering 80mm ED Doublet OTA

    Lunt Engineering - 80mm ED Doublet OTA

    The Lunt 80mm ED Doublet OTA comes with fully multi-coated lenses that can be used for both night time and solar observing (with a solar filter!), depending on your choice.

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    Model#: LE80OTA
    $449.00

  7. Celestron - Omni XLT 120 OTA

    Celestron - Omni XLT 120 OTA

    Globular clusters, close binary star pairs, lunar and planetary images, will delight and amaze you! ... Learn More
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    (48 States)
    Model#: CEL-21090-1
    $499.00

  8. Astro-Tech Black 72mm f/6 ED Doublet Refractor OTA

    Astro-Tech - Black 72mm f/6 ED Doublet Refractor OTA

    Astro-Tech has built this optical tube by increasing their previous aperture of 66mm to a now 72mm. This allows 9% higher resolution and 19% better light gathering. In addition, a new and updated focuser has been supplied with this telescope.

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    (48 States)
    Model#: AT72BK
    $399.00

  9. Astro-Tech - Blue 72mm f/6 ED Doublet Refractor Optical Tube Assembly

    Astro-Tech - Blue 72mm f/6 ED Doublet Refractor Optical Tube Assembly

    Astronomy magazine called this scope’s predecessor, the 66mm Astro-Tech AT66ED, “a product everyone should own.”

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    (48 States)
    Model#: AT72BL
    $399.00

  10. Astro-Tech Green 72mm f/6 ED Doublet Refractor Optical Tube Assembly

    Astro-Tech - Green 72mm f/6 ED Doublet Refractor Optical Tube Assembly

    This green optical tube from Astro-Tech is a piece of equipment every advanced serious astronomer should consider. With high quality refractive optics, fabulous accessories, it is pretty amazing.

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    (48 States)
    Model#: AT72GR
    $399.00

  11. Astro-Tech - White 72mm f/6 ED Doublet Refractor Optical Tube Assembly

    Astro-Tech - White 72mm f/6 ED Doublet Refractor Optical Tube Assembly

    Astronomy magazine called this scope’s predecessor, the 66mm Astro-Tech AT66ED, “a product everyone should own.”

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    (48 States)
    Model#: AT72WH
    $399.00

  12. Opticstar AR90S Gold DS 90mm f/5.5 Apochromat Refractor OTA

    Opticstar - AR90S Gold DS 90mm f/5.5 Achromat Refractor Optical Tube Assembly

    The Opticstar AR90S Gold Dual Speed short-tube refractor is ideal as a portable scope and can be used for observing, imaging or as a guide scope.

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    (48 States)
    Model#: OSRAR90S5GD
    $436.05

  13. Opticstar AR80S Gold DS 80mm f/5 Apochromat Refractor Optical Tube Assembly

    Opticstar - AR80S Gold DS 80mm f/5 Apochromat Refractor Optical Tube Assembly

    The Opticstar AR80S Gold Dual Speed short-tube refractor is ideal as a portable scope and can be used for observing, imaging or as a guide scope.

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    (48 States)
    Model#: OSRAR80SGD
    $379.05

  14. Opticstar AR80S Gold DS 80mm f/5 Apochromat Refractor Guidescope

    Opticstar - AR80S Gold 80mm f/5 Achromatic Refractor Guidescope with Rings, Dovetail, and Crayford Focuser

    The AR80S Guidescope kit consists of the Opticstar AR80S telescope, set of collimating rings and Vixen type dovetail to mount the telescope to standard mount saddles as found on the Sky-Watchers, Celestron CG-5, Vixen and other mounts.

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    (48 States)
    Model#: OSRAR80SGS
    $379.05

  15. Explore Scientific 210mm f/3.8 White Aluminum Photo Newtonian Reflector

    Explore Scientific - 210mm f/3.8 White Aluminum Tube Newtonian Reflector

    The Explore Scientific 210mm White Aluminum Photo Newtonian Reflector has a very fast focal ratio and large aperture making it suitable well for ... Learn More
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    (48 States)
    Model#: PN21038-HRCC
    $499.99

  16. Bresser Messier AR-102/1000 Optical Tube Assembly

    Bresser - Messier AR-102/1000 Optical Tube Assembly

    The Bresser Messier AR-102/1000 Refractor OTA is capable of showing many details in celestial objects like Saturn's rings, Jupiter's cloud bands as well as craters on the moon.

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    (48 States)
    Model#: BR-02100
    $369.00

  17. Bresser Messier AR-127S/635 Optical Tube Assembly

    Bresser - Messier AR-127S/635 Optical Tube Assembly

    The Bresser Messier AR-127S/635 127mm refractor is excellent for touring the solar system! Planets like Jupiter and Saturn will show cloud bands, moons, and even Saturn's rings with just the use of this telescope. Closer to Earth, the moon's craters and surface geological features will all become visible.

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    (48 States)
    Model#: BR-27635
    $519.00

  18. Celestron NexStar 6SE Optical Tube Assembly

    Celestron - NexStar 6SE 150mm Optical Tube Assembly

    Portability and serious performance come together in the NexStar 6 SE. The ultra portable 6 SE features a precision optical system with 1500mm focal length (f/10) and offers 44% more light gathering than a 5" telescope.

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    (48 States)
    Model#: CEL-11068-OTA
    $389.95

  19. Sky-Watcher USA 102mm Maksutov-Cassegrain Optical Tube Assembly

    Sky-Watcher USA - 102mm Maksutov-Cassegrain Optical Tube Assembly

    The Sky-Watcher Maksutov-Cassegrains are the ultimate take-anywhere telescopes. Despite their small dimensions they pack a powerful punch.

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    (48 States)
    Model#: S11510
    $305.00

  20. Sky-Watcher USA - 127mm Maksutov-Cassegrain Optical Tube Assembly

    Sky-Watcher USA - 127mm Maksutov-Cassegrain Optical Tube Assembly

    The Sky-Watcher Maksutov-Cassegrains are the ultimate take-anywhere telescopes. Despite their small dimensions they pack a powerful punch.

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    (48 States)
    Model#: S11520
    $425.00

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