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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 Ultra Fast Astrograph VSD 100 f/3.8 Optical Tube Assembly

    Vixen - Ultra Fast Astrograph VSD 100 f/3.8 Optical Tube Assembly

    The innovative wide and flat imaging field, that covers 645 medium format cameras, and e 5 elements in 5 group lens design completely eliminates a violet tint in chromatic aberration (blue halo).

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    Model#: VSD
    $6,299.00

  2. Vixen - ED80Sf 80mm ED Apochromatic Refractor Telescope OTA with Rings and Dovetail Plate and Focuser --- Comes ONLY with Ring and Dovetail

    Vixen - ED80Sf 80mm ED Apochromatic Refractor Telescope OTA with Rings and Dovetail Plate and Focuser --- Comes ONLY with Ring and Dovetail

    The ED 80SF was initially listed as an entry level APO, but now with so many astronomers giving us such glowing reviews, it appears that we will need to reclassify this product! The ED80Sf refractor features high-grade glass and quality components

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    Model#: 5861
    10% off while supplies last!

    Regular Price: $699.00

    Special Price: $629.10

  3. 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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    Model#: 2614
    10% sale while supplies last!

    Regular Price: $259.00

    Special Price: $233.10

  4. Vixen - 81mm ED81S (f/7.7) ED Apochromatic Optical Tube Assembly

    Vixen - 81mm ED81S (f/7.7) ED Apochromatic Optical Tube Assembly

    When The ED81S was introduced , it set a new standard for APO Refractors. The combination of better color correction from the new ED glass and brighter images from its fast f/7.

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    Model#: 5864
    30% sale while supplies last!

    Regular Price: $1,499.00

    Special Price: $1,049.30

  5. Vixen ED80Sf Apochromatic Optical Tube Assembly

    Vixen - 80mm ED80Sf (f/7.5) ED Apochromatic Optical Tube Assembly

    The ED 80SF was initially listed as an entry level APO, but now with so many astronomers giving us such glowing reviews, it appears that we will need to reclassify this product!

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    Model#: 2617
    10% sale while supplies last!

    Regular Price: $599.00

    Special Price: $539.10

  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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    Model#: 2603
    10% sale while supplies last!

    Regular Price: $239.00

    Special Price: $215.10

  7. 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

  8. Vixen - 330mm VMC330L (f/13) Maksutov-Cassegrain Optical Tube Assembly

    Vixen - 330mm VMC330L (f/13) Maksutov-Cassegrain Optical Tube Assembly

    The VIXEN VMC330L telescope is a unique catadioptric telescope. With two mirrors and two high-precision corrector lenses, one of which is a meniscus, the VMC330L produces sharp images with no hint of false color

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    Model#: 5832
    $14,999.00

  9. Vixen - 200mm VMC200L (f/9.75) Catadioptrical Reflector Optical Tube Assembly

    Vixen - 200mm VMC200L (f/9.75) Catadioptrical Reflector Optical Tube Assembly

    The VMC200L is a unique catadioptric optical system. It incorporates a primary mirror and a meniscus corrector just before a secondary mirror. By doing so, light is corrected twice on the optical path.

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    Model#: 5829
    10% off while supplies last!

    Regular Price: $1,199.00

    Special Price: $1,025.00

  10. Vixen 200mm VC200L OTA

    Vixen - 200mm VC200L (f/9) Catadioptrical Reflector Optical Tube Assembly

    The VC200L is designed for Astro Imaging.   Even at the edge of the 35mm film format (larger CCD chips) stars are sharp ( smaller than 15 micrometers).

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    Model#: 5870

    Regular Price: $1,899.00

    Special Price: $1,299.00

  11. Vixen R200SS Optical Tube Assembly

    Vixen - 200mm R200Ss (f/4) Newtonian Reflector Optical Tube Assembly

    The telescope's large aperture and compact body make it ideally suited for astrophotography of nebulae, star clusters and comets. The use of the optional coma corrector allows for a sharp coma-free image from edge to edge, and the rack and pinion focuser, with an adapter, accepts 2 eyepieces.

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    Model#: 5869
    10% sale while supplies last!

    Regular Price: $1,599.00

    Special Price: $1,439.10

  12. Vixen 140mm NA140SSf f/5.7 Neo Achromat Optical Tube Assembly Newer Model

    Vixen - 140mm NA140SSf (f/5.7) Neo Achromat Optical Tube Assembly - Newer Model

    Weighing in at 14.3 lbs this 5.5 inch Vixen telescope is an incredible performer. Deep Sky objects are easily visible and Astro-Imagers looking for a fast instrument with clear aperture will be impressed with the NA140’s performance.

    Now with the 2 Speed focuser,  flip mirror , 7x50 FinderScope and Tube Rings complete

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    Model#: 58681
    $1,999.00

  13. Vixen 140mm NA140SSf (f/5.7) Neo Achromat Optical Tube Assembly

    Vixen - 140mm NA140SSf (f/5.7) Neo Achromat Optical Tube Assembly

    Weighing in at 14.3 lbs this 5.5 inch Vixen telescope is an incredible performer. Deep Sky objects are easily visible and Astro-Imagers looking for a fast instrument with clear aperture will be impressed with the NA140’s performance.

    Now with the 2 Speed focuser,  flip mirror , 7x50 FinderScope and Tube Rings complete

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    (48 States)
    Model#: 5868

    Regular Price: $1,799.00

    Special Price: $1,699.00

  14. 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

  15. Vixen - 115mm ED115S (f/7.7) ED Apochromatic Optical Tube Assembly

    Vixen - 115mm ED115S (f/7.7) ED Apochromatic Optical Tube Assembly

    The astro-photographer will be especially pleased with the high contrast images through this telescope and the full objective diameter of 4".

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    (48 States)
    Model#: 5866
    $2,999.00

  16. 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

  17. Vixen - 103mm ED103S (f/7.7) ED Apochromatic Refractor Optical Tube Assembly

    Vixen - 103mm ED103S (f/7.7) ED Apochromatic Refractor Optical Tube Assembly

    The newly designed high definition ED lens in Vixen's ED103S Refractor gives excellent optical performance in a short optical tube for easy handling.

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    (48 States)
    Model#: 5865
    27% sale while supplies last!

    Regular Price: $2,199.00

    Special Price: $1,595.00

  18. Vixen - 103mm AX103S (f/8) Apochromatic Refractor Optical Tube Assembly

    Vixen - 103mm AX103S (f/8) Apochromatic Refractor Optical Tube Assembly

    The built in Dual Speed Focuser enables coarse and fine focus adjustments. Sky at Night Magazine states: "With its excellent build quality and rich feature set, we thoroughly recommend this system if you’re looking to upgrade from your current setup".

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    (48 States)
    Model#: 5867
    $3,199.00

  19. Vixen - 100mm ED100Sf (f/9) ED Apochromatic Refractor Telescope Optical Tube Assembly - (Dual focuser) --- Comes ONLY with ring and dovetail

    Vixen - 100mm ED100Sf (f/9) ED Apochromatic Refractor Telescope Optical Tube Assembly - (Dual focuser) --- Comes ONLY with ring and dovetail

    100Sf is now available for the first time in the US. It is the big brother of our best selling ED80Sf. This APO refractor features high-grade glass and quality components. Coupled with a medium f/9.0 Dual Focuser

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    FREE SHIPPING
    (48 States)
    Model#: 5862

    Regular Price: $999.00

    Special Price: $699.00

  20. TeleVue - TV-85 Evergreen  85mm, f/7, APO (Doublet) Refractor

    TeleVue - TV-85 Evergreen 85mm, f/7, APO (Doublet) Refractor

    With APO performance and airline portability, the Tele Vue-85 has been delighting astronomy and birding enthusiasts and reviewers alike. ... Learn More
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    (48 States)
    Model#: GXF-3371

    Regular Price: $2,350.00

    Special Price: $2,195.00

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