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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. Vixen A70Lf OTA

    Vixen - 70mm A70Lf (f/12.9) Achromatic Refractor Optical Tube Assembly

    The A70Lf, although inexpensive, is not a toy telescope. Many amateurs begin with and enjoy countless hours under the stars with this instrument It has the same quality glass and exacting workmanship that goes into our much larger instruments

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    Model#: 2602
    30% sale while supplies last!

    Regular Price: $139.00

    Special Price: $97.99

  2. Orion - Starblast 4.5 Imaging Optical Tube Assembly

    Orion - Starblast 4.5 Imaging Optical Tube Assembly

    Simply the most affordable astrophotography-optimized telescope available! Big 4.5" primary mirror and fast f/4 focal ratio produce stunning images with short exposure times.

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    Model#: 09974
    $149.95

  3. R130Sf Optical Tube Assembly

    Vixen - 130mm R130Sf (f/5) Newtonian Reflector Optical Tube Assembly

    This lightweight 5" reflector is a favorite of many new astronomers because it features remarkable light gathering with sharp images for its price and size. With a standard 20mm Plssl more than the entire moon fills the eyepiece

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    Model#: 2604
    30% sale while supplies last!

    Regular Price: $229.00

    Special Price: $160.00

  4. Celestron C6-N Newtonian Optical Tube Assembly

    DISCONTINUED: Celestron - C6-N Newtonian Optical Tube Assembly

    This is a discontinued item. We recommend the new versions of Celestron Newtonian Reflectors as replacements.

    • 1.25" focuser
    • Mounting rings
    • 6x30 Finderscope
    • 20mm Plossl
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    Model#: 31056-OTA
  5. Borg 50mm F5 Achromat

    Borg - 50mm F5 Achromat

    Mini Borg scopes may be mounted directly with a 1/4"-20 threaded screw into the standard mounting block (left), or in an available finder bracket.

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    (48 States)
    Model#: 6150
    $215.00

  6. Vixen - 80mm A80Mf (f/11.4) Achromatic Refractor Optical Tube Assembly

    Vixen - 80mm A80Mf (f/11.4) Achromatic Refractor Optical Tube Assembly

    If you are looking to start out with something a little larger than a beginner scope or need a better finder scope for your large telescope, the A80Mf is the one to buy

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    (48 States)
    Model#: 2603
    10% sale while supplies last!

    Regular Price: $239.00

    Special Price: $215.10

  7. Vixen - 95mm VMC95L (f/11) Modified Cassegrain Optical Tube Assembly

    Vixen - 95mm VMC95L (f/11) Modified Cassegrain Optical Tube Assembly

    The Vixen VMC95L, is a 95 mm (3.7 inch) aperture modified Cassegrain f/11 optical tube assembly.The VMC95L is intriguing in its own right with interesting features including a curved vane Secondary Mirror Spider to reduce diffraction effects

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    (48 States)
    Model#: 2614
    10% sale while supplies last!

    Regular Price: $259.00

    Special Price: $233.10

  8. Celestron - Omni XLT 150 OTA

    Celestron - Omni XLT 150 OTA

    Omni XLT series features the stable platform of the CG-4 mount and high quality optics. ... Learn More
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    (48 States)
    Model#: 31057-1
    $269.95

  9. Borg - 60mm ED f/5.4 (325mm FL) Achromat

    Borg - 60mm ED f/5.4 (325mm FL) Achromat

    Mini Borg scopes may be mounted directly with a 1/4"-20 threaded screw into the standard mounting block (left), or in an available finder bracket.

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    (48 States)
    Model#: 6161
    $299.00

  10. Vixen - 110mm VMC110L (f/9.4) Modified Cassegrain Optical Tube Assembly

    Vixen - 110mm VMC110L (f/9.4) Modified Cassegrain Optical Tube Assembly

    One of the best multi purpose Grab and Go Reflector Telescopes. This is a compact optical tube, with features found on our higher end telescopes.

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    (48 States)
    Model#: 26052
    $299.00

  11. Borg Series 45 Optical Tube - White

    Borg - Series 45 Optical Tube - White

    The Borg Series 45 telescopes are based around a 45mm diameter tube and the 42mm/P1 thread used on the popular M42 photographic system.

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    (48 States)
    Model#: 6036
    $315.00

  12. Takahashi - Collimating Telescope for Refractors, Cassegrains, & Ritchey-Chretiens

    Takahashi - Collimating Telescope for Refractors, Cassegrains, & Ritchey-Chretiens

    Designed for use on refractor, Ritchey-Chrieten and classical Cassegrain telescopes. The Takahashi Collimating Telescope is also used on the Takahashi CN-212, Mewlons and refractors of 820mm or more in focal length

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    FREE SHIPPING
    (48 States)
    Model#: TCE0100
    $320.95

  13. Borg Series 45 Optical Tube Black

    Borg - Series 45 Optical Tube - Black

    The Borg Series 45 telescopes are based around a 45mm diameter tube and the 42mm/P1 thread used on the popular M42 photographic system.

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    (48 States)
    Model#: 6037
    $335.00

  14. Borg - Mini Borg 45EDII F7.2

    Borg - Mini Borg 45EDII F7.2

    Mini Borg scopes are compatible with a wide variety of standard Borg back-end accessories:

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    (48 States)
    Model#: 6045
    $375.00

  15. 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
    $379.00

  16. 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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    FREE SHIPPING
    (48 States)
    Model#: AT72BL
    $379.00

  17. Astro-Tech - Red 72mm f/6 ED Doublet Refractor Optical Tube Assembly

    DISCONTINUED: Astro-Tech - Red 72mm f/6 ED Doublet Refractor Optical Tube Assembly

    This is a discontinued item. We recommend the Astro-Tech White 72mm Refractor or Black 72mm Refractor as replacements.

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

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    FREE SHIPPING
    (48 States)
    Model#: AT72R
  18. 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
    $379.00

  19. 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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    FREE SHIPPING
    (48 States)
    Model#: AT72BK
    $379.00

  20. 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. It uses a 80mm achromatic doublet that is fully broad-band multicoated to increase light transmission.

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    FREE SHIPPING
    (48 States)
    Model#: OSRAR80SGD

    Regular Price: $399.00

    Special Price: $379.05

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