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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. 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

  2. Orion - Premium 190mm F/5.3 Mak-Newt Astrograph Telescope OTA

    DISCONTINUED: Orion - Premium 190mm F/5.3 Mak-Newt Astrograph Telescope OTA

     PLease see the following item for replacement

    Orion - 8 " f/8 Ritchey Cretien Optical Tub

    High-performance imaging telescope rivals apochromatic refractors, but at a fraction of the price Large 190mm (7.5 inch) Maksutov-Newtonian optics deliver optically flat image, fast f/5

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    Model#: 09978
  3. Orion - 8" f/8 Ritchey-Chretien Astrograph Telescope

    Orion - 8" f/8 Ritchey-Chretien Astrograph Telescope

    Orion is proud to introduce this highly regarded telescope design used by advanced astrophotographers worldwide . ... Learn More
    Model#: 08958
    $1,195.00

  4. Orion - 8 " f/8 Ritchey Cretien Optical Tube Assembly

    Orion - 8 " f/8 Ritchey Cretien Optical Tube Assembly

    * Ritchey-Chretien optical design produces superb flat-field, coma-free images that are superior to those achievable with conventional reflector or Schmidt-Cassegrain telescopes * One of the most compact Ritchey-Chretien astrographs available, at ... Learn More
    Model#: 8958
    $1,195.95

  5. Orion - 180mm Maksutov-Cassegrain Telescope Optical Tube

    Orion - 180mm Maksutov-Cassegrain Telescope Optical Tube

    Looking for something to satisfy your appetite for power? Try a big Mak! For the most demanding enthusiast, our Orion 180mm Maksutov-Cassegrain Telescope sets a new standard for superb high-power performance in a remarkably compact design.

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    Model#: 09969
    $1,219.95

  6. Orion - 100mm ED Refractor Optical Tube Assembly

    DISCONTINUED: Orion - 100mm ED Refractor Optical Tube Assembly

    Recently, Astronomy magazine ran a "buyer's guide" to portable 4" apochromatic refractors. All were impressive scopes, no doubt. But considering their price tags, which ranged from $2,695 (yes, that was the cheapest) to $3,595, you'd be excused if you didn't run right out and throw down your credit card for one. Here's something more practical: our 100mm ED apochromatic refractor.

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    Model#: 09975
  7. Orion 10" f/8 Ritchey Cretien Optical Tube Assembly

    Orion - 10 " f/8 Ritchey Cretien Optical Tube Assembly

    Go after even the most elusive and faint deep-sky targets with the Orion 10" f/8.0 Ritchey-Chretien Astrograph. Featuring virtually coma-free optics for superb imaging performance, the Orion 10" f/8.0 Ritchey-Chretien Astrograph boasts a plethora of deluxe features

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    Model#: 8961
    $2,694.95

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