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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. Explore Scientific - ED102 Air Spaced Carbon Fiber Triplet Refractor Telescope *

    Explore Scientific - ED102 Air Spaced Carbon Fiber Triplet Refractor Telescope *

    Explore Scientific uses ED (Extra-low Dispersion) FCD1 (Dense Fluor Crown) glass developed and manufactured by Hoya Optical of Japan.

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    Model#: EDT-10207-CF
    Thanksgiving Special 15% OFF - ENDS NOV 26th

    Regular Price: $1,729.99

    Special Price: $1,470.50

  2. Explore Scientific - ED127 APO Air Spaced Carbon Fiber Triplet Refractor Telescope *

    Explore Scientific - ED127 APO Air Spaced Carbon Fiber Triplet Refractor Telescope *

    The Explore Scientific 127mm f/7.5 Air-Spaced Triplet ED APO produces a visual experience that is often compared to much larger aperture reflector telescopes.

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    Model#: EDT-127075-CF
    Thanksgiving Special 15% OFF - ENDS NOV 26th

    Regular Price: $2,499.99

    Special Price: $2,125.00

  3. Explore Scientific ED80 Air Spaced Carbon Fiber Triplet Refractor Telescope

    Explore Scientific - ED80 Air Spaced Carbon Fiber Triplet Refractor Telescope *

    This 80mm f/6 ED Apochromatic triplet is an air-spaced triplet refractor telescope for observing and photography of celestial objects.

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    Model#: EDT-0806-CF
    Thanksgiving Special 15% OFF - ENDS NOV 26th

    Regular Price: $1,149.99

    Special Price: $977.50

  4. Explore Scientific 152mm f/8 Carbon Fiber Triplet Refractor Telescope with 3" Focuser

    Explore Scientific - 152mm f/8 Carbon Fiber Triplet Refractor Telescope with 3" Focuser

    The Explore Scientific ED152 refractor utilizes a carbon fiber for a lightweight optical tube that resists fluctuations in temperature changes, saving you the annoyance of refocusing making it particularly well suited to astro-photography.

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    Model#: TED15208CFC3
    $5,999.99

    Out of stock

  5. Explore Scientific - ED 152 Carbon Fiber Edition f/8 Air Spaced Triplet Refractor with Rack and Pinion Focuser *

    Explore Scientific - ED 152 Carbon Fiber Edition f/8 Air Spaced Triplet Refractor with Rack and Pinion Focuser *

    The 6" (152mm) aperture Explore Scientific ES152CF with JOC focuser uses a premium Hoya ED glass element and state-of-the-art optical multicoatings in its ... Learn More
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    Model#: TED15208CF-C3
    Thanksgiving Special 15% OFF - ENDS NOV 26th

    Regular Price: $5,999.99

    Special Price: $5,100.00

  6. Explore Scientific 210mm f/3.8 White Aluminum Photo Newtonian Reflector

    Explore Scientific - 210mm f/3.8 White Aluminum Tube Newtonian Reflector *

    The Explore Scientific 210mm White Aluminum Photo Newtonian Reflector has a very fast focal ratio and large aperture making it suitable well for ... Learn More
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    Model#: PN21038-HRCC
    Thanksgiving Special 15% OFF - ENDS NOV 26th

    Regular Price: $899.99

    Special Price: $765.00

  7. Explore Scientific ED80mm f/6 Classic White "Essential Series" Air-Spaced Triplet Refractor

    Explore Scientific - ED80mm f/6 Classic White "Essential Series" Air-Spaced Triplet Refractor *

    This 80mm f/6 ED Apochromatic triplet is an air-spaced triplet refractor telescope for observing and photography of celestial objects. Instrument utilizing Hoya ED glass, comes equipped with a 99% dielectric-coated 2-inch diagonal. Case, Finder Scope and Mount NOT included.

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    Model#: ES-ED0806-01
    $100 off +Thanksgiving Special 15% OFF - ENDS NOV 26th

    Regular Price: $729.99

    Special Price: $535.49

  8. Explore Scientific 102mm f/7 ED Apochromatic Triplet Essential Refractor Telescope

    Explore Scientific - 102mm f/7 ED Apochromatic Triplet Essential Refractor Telescope *

    The Explore Scientific 102mm f/7 Air-Spaced Triplet ED APO Telescope made Wired Magazine''s Wish List for cool gifts and is a perfect instrument for demanding wide field observing and astrophotography.

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    Model#: ES-ED10207-01
    $200.00 OFF + Thanksgiving Special 15% OFF - ENDS NOV 26th

    Regular Price: $1,249.99

    Special Price: $892.49

  9. Explore Scientific - 152mm f/6.5 Achromatic Optical Tube Assembly *

    Explore Scientific - 152mm f/6.5 Achromatic Optical Tube Assembly *

    The AR152 (six-inch), with its larger aperture optics gathers 44% more light over the AR127 (five-inch) model, providing much brighter images and higher resolution

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    Model#: DAR152065-01
    Thanksgiving Special 15% OFF - ENDS NOV 26th

    Regular Price: $749.99

    Special Price: $637.50

  10. Explore Scientific AR127 f/6.5 Air-Spaced Doublet Achromat Refractor

    Explore Scientific - AR127 f/6.5 Air-Spaced Doublet Achromat Refractor *

    AR127 f/6.5 Air-Spaced Doublet with EMD Coatings; Deluxe Two-Speed 2-inch Crayford Focuser; Cradle Rings with Handle and Vixen-Style Dovetail Mount; 8x50 Straight Finderscope; Enhanced 99% Reflective 2-inch Diagonal with 1.25-inch Adapter

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    (48 States)
    Model#: DAR127065-01
    Thanksgiving Special 15% OFF - ENDS NOV 26th

    Regular Price: $599.99

    Special Price: $510.00

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