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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 - 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#: ORI-07380

    Available - Ships in 2-4 Days

    $126.95

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

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

    As one of our satisfied customers put it, the Orion 190mm Maksutov-Newtonian Astrograph Telescope gives "BIG APO Refractor-like performance at 1/3 the cost", not to mention the savings over smaller premium astrographs.

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    Model#: ORI-09978

    Available - Ships in 2-4 Days

    $1,599.99

  3. 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#: ORI-09969

    Available - Ships in 2-4 Days

    $1,199.99

  4. 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#: ORI-09946

    In Stock

    $169.99

  5. Orion EON 115mm ED Triplet Apochromatic Refractor Telescope

    Orion - EON 115mm ED Triplet Apochromatic Refractor Telescope

    The Orion EON 115mm ED Triplet Refractor as a well affordable priced wide field instrument, excellent for astrophotographers who strive for a true-color instrument.

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    Model#: ORI-10087

    Available - Ships in 2-4 Days

    $1,799.99

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