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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. 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

  2. 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

  3. 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
    $299.95

  4. Celestron - 6" Newtonian Reflector Optical Tube Assembly

    Celestron - 6" Newtonian Reflector Optical Tube Assembly

    The Celestron Advanced VX 6" Newtonian Telescope is excellent for basic deep sky observing as well as planetary observing due to its impressive light gathering power of the mirrors and mid fast focal ratio.

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    Model#: 32054-OTA

    Regular Price: $269.00

    Special Price: $179.00

  5. Orion ShortTube 80-T Refractor Telescope

    Orion - ShortTube 80-T Refractor Telescope

    The Orion ShortTube 80-T Optical Tube assembly is an f/5 multi-coated 400mm refractor that provides excellent wide field of views with excellent contrast for viewing planets.

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    Model#: 09946

    Regular Price: $179.99

    Special Price: $149.99

  6. Bresser Messier AR-90/900 Optical Tube with EXOS-1 EQ Mount and Tripod

    Bresser - Messier AR-90/900 Optical Tube with EXOS-1 EQ Mount and Tripod

    With a light gathering power of 200x more than the human eye, the Bresser Messier AR-90/900 is an excellent telescope for beginner astronomers that still want to detailed views delivered. Details in Saturn's rings, storms on Jupiter, moon craters and even the seasons of Mars are all apparent through this telescope.

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    Model#: BR-90900

    Regular Price: $440.99

    Special Price: $299.00

  7. Bresser - Messier AR-80/900 Optical Tube with EQ Sky Mount and Tripod

    Bresser - Messier AR-80/900 Optical Tube with EQ Sky Mount and Tripod

    The Bresser Messsier AR-80/900 is an excellent scope for beginners due to its remarkable light gathering power for better detailed observation.

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    Model#: BR-80900

    Regular Price: $313.99

    Special Price: $209.00

  8. 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

  9. Orion - 80mm f/11.4 Refractor Telescope Optical Tube

    Orion - 80mm f/11.4 Refractor Telescope Optical Tube

    * Ideal for use as a guide scope * Guiding enables long exposure astrophotography * 1.25" focuser * One-year limited warrantyThis quality Orion 80mm F/11 ... Learn More
    Model#: 07380
    $126.95

  10. 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

  11. 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

  12. 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

  13. 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

13 Item(s)

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