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

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

    Explore Scientific Instruction Booklet for Triplet Refractors

    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 + An Extra 20% OFF Holiday Special!

    Regular Price: $729.99

    Special Price: $503.49

  2. 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.

    Explore Scientific Instruction Booklet for Triplet Refractors

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    Model#: EDT-0806-CF
    Super Deal! Explore Scientific 20% OFF

    Regular Price: $1,149.99

    Special Price: $919.49

  3. 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.

    Explore Scientific Instruction Booklet for Triplet Refractors

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    Model#: EDT-127075-CF
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    Regular Price: $2,499.99

    Special Price: $1,999.49

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

    Explore Scientific - ED102mm f/7 Classic White "Essential Series" Air-Spaced Triplet Refractor *

    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.

    Explore Scientific Instruction Booklet for Triplet Refractors

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    Model#: ES-ED10207-01
    $200.00 OFF + An Extra 20% OFF Holiday Special!

    Regular Price: $1,249.99

    Special Price: $839.49

  5. 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.

    Explore Scientific Instruction Booklet for Triplet Refractors

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    Model#: EDT-10207-CF
    Super Deal! Explore Scientific 20% OFF

    Regular Price: $1,729.99

    Special Price: $1,383.49

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

    Explore Scientific - ED 152mm 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
    $4,999.99

  7. 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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    Model#: DAR127065-01
    Super Deal! Explore Scientific 20% OFF

    Regular Price: $599.99

    Special Price: $479.49

  8. 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
    Starts shipping approximately First Quarter
    $899.99

  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
    Super Deal! Explore Scientific 20% OFF

    Regular Price: $749.99

    Special Price: $599.49

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