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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 ED152 Air Spaced Triplet Refractor Carbon Fiber Telescope

    Explore Scientific - ED152mm Air Spaced Triplet Refractor Carbon Fiber Telescope

    The Explore Scientific 152mm f/8 Air-Spaced Triplet ED APO Refractor produces a visual experience that is often

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    Model#: TED15208-CF

    In Stock

    $4,894.99

  2. Explore Scientific ED127 Classic White Air-Spaced Triplet Refractor

    Explore Scientific - ED127 Classic White "Essential Series" Air-Spaced Triplet Refractor - Fully Warranted - OPEN BOX

    The Explore Scientific 127mm f/7.5 Air-Spaced Triplet ED APO Refractor is excellent for both planetary and deep sky observation.

    Explore Scientific Instruction Booklet for Triplet Refractors

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    Model#: ED127075-03-OPEN

    In Stock

    Regular Price: $1,899.99

    Special Price: $1,450.00

  3. Explore Scientific - ED80 Classic White f/6 Air Spaced Triplet with Hoya FCD100 Optics with 2.5" HEX Focuser

    Explore Scientific - ED80 Classic White f/6 Air Spaced Triplet with Hoya FCD100 Optics with 2.5" HEX Focuser

    The Explore Scientific 80mm FCD100 refractor telescope is a premium choice for a travel telescope. Featuring Hoya FCD100 optical glass, each optical surface is EMD coated for optimal light transmission, brilliant contrast and true color. Weighs just 7.5 pounds and is only 18.5 inches long with the dew shield attached. Includes a 2.5" HEX focuser capable of carrying up to 10 pounds.

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    Model#: FCD100-8006-01

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    $999.99

  4. Explore Scientific - ED102 Classic White f/7 Air Spaced Triplet with Hoya FCD100 Optics and 2.5" HEX Focuser

    Explore Scientific - ED102 Classic White f/7 Air Spaced Triplet with Hoya FCD100 Optics and 2.5" HEX Focuser

    The <strong>Explore Scientific 102mm FCD100 APO refractor telescope</strong> features Hoya-FCD100 optical glass and premium EMD coatings for superior contrast and color rendition.  This highly portable scope weighs just 12 pounds and makes a great guide scope or stand alone imager and observing telescope. Includes the Explore Scientific 2.5" HEX focuser.

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    Model#: FCD100-10207-01

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    $1,499.99

  5. Explore Scientific - ED127 Classic White f/7.5 Air Spaced Triplet with Hoya FCD100 Optics and 2.5" HEX Focuser

    Explore Scientific - ED127 Classic White f/7.5 Air Spaced Triplet with Hoya FCD100 Optics and 2.5" HEX Focuser

    The Explore Scientific 127mm f/7.5 FCD100 APO Refractor features the Explore Scientific HEX 2.5" focuser capable of carrying up to 10 pounds, premium Hoya FCD100 optical glass and EMD coatings on all optical surfaces housed in an aluminum optical tube. Includes rings, and Vixen style dovetail. ... Learn More
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    Model#: FCD100-127075-01

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    $1,999.99

  6. Explore Scientific - ED127 Classic White f/7.5 Air Spaced Triplet with Hoya FCD100 Optics and Starlight Feathertouch Two-Speed TRUE 3" Focuser
  7. Explore Scientific - ED127 f/7.5 Air-Spaced Carbon Fiber Triplet Refractor with Retractable Dew Shield and Starlight Feathertouch Two-Speed TRUE 3" Focuser
  8. 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

    In Stock

    $599.99

  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

    In Stock

    $799.99

  10. 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

    In Stock

    $1,999.99

  11. 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

    In Stock

    $1,499.99

  12. 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

    Available

    $999.99

  13. 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#: ED10207-01

    In Stock

    $999.99

  14. 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#: ED0806-01

    In Stock

    $699.99

  15. 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

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    $499.99

  16. Explore Scientific ED 152 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 3" HEXagonal 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

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    Model#: TED15208CF-C3

    In Stock

    $3,999.99

  17. 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 - Fully Warranted - OPEN BOX

    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#: ED0806-01-OPEN

    In Stock

    $589.00

  18. Explore Scientific ED102 Air Spaced Carbon Fiber Triplet Refractor Telescope

    Explore Scientific - ED102 Air Spaced Carbon Fiber Triplet Refractor Telescope with Bresser EXOS2GT Mount

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

    This German Equatorial mount is equipped with motors on both axes, allowing the mount to track astronomical objects accurately. The precision gears allow operation with a minimum of backlash on all nine slewing speeds.

    Explore Scientific Instruction Booklet for Triplet Refractors

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    Model#: EDT10207CF-EXOS2GT

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    $1,999.99

  19. Explore Scientific 208mm Newtonian f/3.9 with Carbon Fiber Tube

    Explore Scientific - 208mm Newtonian f/3.9 with Carbon Fiber Tube

    Explore Scientific - 208MM NEWTONIAN F/3.9 WITH CARBON FIBER TUBE

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    Model#: N208CF

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    $599.99

  20. Explore Scientific - ED127 APO Carbon Fiber Triplet Refractor Telescope w/ Flattener

    Explore Scientific - ED127 APO Carbon Fiber Triplet Refractor Telescope w/ Flattener

    Special Buy! Get a 127mm APO Carbon Fiber Triplet Refractor with a 2" Field Flattener for just $1999! A savings of $150 off standard retail! This is NEW product but discontinued product. Full manufacturer warranty included. Quantity limited. 

    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-127075CF-FF2

    In Stock

    Regular Price: $2,148.99

    Special Price: $1,999.99

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