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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.

20 Item(s)

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  1. Explore Scientific AR102 f/6.5 Air-Spaced Doublet Achromatic Refractor Telescope

    DISCONTINUED: Explore Scientific - AR102 f/6.5 Air-Spaced Doublet Achromatic Refractor Telescope

    This is a discontinued item. We recommend the newer version of the AR102 Refractor as a replacement.

    and the AR152, these are classic air-spaced, crown-and-flint, doublet achromatic refractors with superior-class optical figure, in a short (f/6.5) focal length design.

    ...
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    (48 States)
    Model#: DAR102065-00
  2. Explore Scientific - 127mm f/6.5 Achromatic Refractor Optical Tube Assembly

    DISCONTINUED: Explore Scientific - 127mm f/6.5 Achromatic Refractor Optical Tube Assembly

    This is a discontinued item. We recommend the newer version of the AR127 as a replacement.

    The 127mm f/6.5 Achromatic refractor from Explore Scientific is an air spaced doublet refractor telescope mainly for visual observing celestial objects.

    Purchase A DAR127 and get $129.95 In accesories At N/C 9.7mm, 20mm 70 degree and a Red flash light!!!

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    (48 States)
    Model#: DAR127065-00
  3. Explore Scientific - ED80 Classic White "Essential Series" Air Spaced Triplet Apochromatic Telescope

    DISCONTINUED: Explore Scientific - ED80 Classic White "Essential Series" Air Spaced Triplet Apochromatic Telescope

    This is a discontinued item. We recommend the newer version of the Explore Scientific ED80 White Essential Series Apochromatic Refractor as a replacement.

    The Explore Scientific 80mm f/6 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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    FREE SHIPPING
    (48 States)
    Model#: ES-ED0806-00
  4. 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

    Regular Price: $1,556.99

    Special Price: $699.99

  5. 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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    (48 States)
    Model#: ES-ED0806-01

    Regular Price: $1,622.99

    Special Price: $729.99

  6. Explore Scientific - 80mm Air-Spaced Triplet ED Refractor Telescope

    DISCONTINUED: Explore Scientific - 80mm Air-Spaced Triplet ED Refractor Telescope

    This is a discontinued item. Check out the newer version of the ED80 from Explore Scientific as a replacement.

    The 80mm f/6 ED Apochromatic triplet from Explore Scientific is a great air-spaced triplet refractor telescope for observing as well as for use in photography of celestial objects.

    ...
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    FREE SHIPPING
    (48 States)
    Model#: TED0806-00
  7. 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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    (48 States)
    Model#: DAR152065-01

    Regular Price: $1,889.99

    Special Price: $849.99

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

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

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

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    (48 States)
    Model#: PN21038-HRCC

    Regular Price: $2,000.99

    Special Price: $899.99

  9. Explore Scientific - 152mm f/4.8 Comet Hunter OTA with Deluxe Case and Accessories

    DISCONTINUED: Explore Scientific - 152mm f/4.8 Comet Hunter OTA with Deluxe Case and Accessories

    This is a discontinued item. We recommend the MN06048CF-04 optical system as a replacement.

    The David H. Levy Comet Hunter is a rich field telescope (RFT), capable of showing faint objects over a wide field of view (generally two degrees or more).

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    (48 States)
    Model#: MN06048CF-00
  10. Explore Scientific - 102mm Air-Spaced Triplet ED Refractor Telescope

    DISCONTINUED: Explore Scientific - 102mm Air-Spaced Triplet ED Refractor Telescope

    This is a discontinued product. We recommend the Explore Scientific 102mm ED Apochromatic Refractor as a replacement. 

    This 102mm f/7 telescope from Explore Scientific is an air-spaced triplet ED APO refractor that utilizes Hoya ED glass. The telescope is equipped with a 99% dielectric-coated 2-inch diagonal as well as a 8x50 viewfinder making it easy to search for celestial objects. A case with a foam insert is also included with the telescope.

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    (48 States)
    Model#: TED10207-00
  11. Explore Scientific ED102 Classic White "Essential Series" Air Spaced Triplet Apochromatic Telescope

    DISCONTINUED: Explore Scientific - ED102 Classic White "Essential Series" Air Spaced Triplet Apochromatic Telescope

    This is a discontinued item. We recommend the newer version of the 102mm f/7 ED Apochromatic Refractor from Explore Scientific as a replacement.

    The Explore Scientific 80mm f/6 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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    FREE SHIPPING
    (48 States)
    Model#: ES-ED10207-00
  12. Explore Scientific - David H. Levy Comet Hunter f/4.8 Carbon Fiber Maksutov Newtonian Optical Tube Assembly

    DISCONTINUED: Explore Scientific - David H. Levy Comet Hunter f/4.8 Carbon Fiber Maksutov Newtonian Optical Tube Assembly

    This is a discontinued item. We recommend the newer version of the Explore Scientific David H. Levy Comet Hunter 152mm Carbon Fiber OTA as a replacement.

    The Explore Scientific David H. Levy Comet Hunter is the result of a dream collaboration between long-time amateur astronomer & Explore Scientific founder, Scott Roberts, and one of his life-long heroes, David H. Levy. NOTE: Case, Finder Scope and Eyepiece NOT Included with this package

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    (48 States)
    Model#: MN06048CF-03
  13. 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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    FREE SHIPPING
    (48 States)
    Model#: EDT-0806-CF

    Regular Price: $2,556.99

    Special Price: $1,149.99

  14. Explore Scientific 80mm f/6 Air-Spaced Triplet ED Apochromatic Refractor w/ Deluxe Case Accessories TwiLight II Heavy-Duty Dual-Head Mount

    DISCONTINUED: Explore Scientific - 80mm f/6 Air-Spaced Triplet ED Apochromatic Refractor w/ Deluxe Case & Accessories & TwiLight II Heavy-Duty Dual-Head Mount

    This is a discontinued item. We recommend the newer version of the ED80 and the Twilight II Heavy Duty Dual Head mount as a replacement.

    The 80mm f/6 ED Apochromatic triplet from Explore Scientific is a great air-spaced triplet refractor telescope for observing as well as for use in photography of celestial objects

    ...
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    FREE SHIPPING
    (48 States)
    Model#: TED0806-00-MAZ02-01
  15. 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.

    ...
    Learn More
    FREE SHIPPING
    (48 States)
    Model#: ES-ED10207-01

    Regular Price: $2,778.99

    Special Price: $1,249.99

  16. Explore Scientific - ED127 Classic White "Essential Series" Air Spaced Triplet Apochromatic Telescope

    DISCONTINUED: Explore Scientific - ED127 Classic White "Essential Series" Air Spaced Triplet Apochromatic Telescope

    This is a discontinued item. We recommend the newer version of the Explore Scientific ED127 Classic White Air-Spaced Triplet Refractor as a replacement.

    The Explore ED127 Essential Edition telescope comes with a white aluminum tube with black accents.

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    FREE SHIPPING
    (48 States)
    Model#: ES-ED127075-02
  17. Explore Scientific - 127mm Air-Spaced Triplet ED Refractor Telescope

    DISCONTINUED: Explore Scientific - 127mm Air-Spaced Triplet ED Refractor Telescope

    This is a discontinued item. We recommend the newer version of the Explore Scientific 127mm Air-Spaced Triplet Refractor as a replacement.

    Explore Scientific's 127mm f/7.5 telescope is an air-spaced triplet ED APO refractor telescope that utilizes Hoya ED glass.

    ...
    Learn More
    FREE SHIPPING
    (48 States)
    Model#: TED127075-00
  18. 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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    (48 States)
    Model#: EDT-10207-CF

    Regular Price: $3,844.99

    Special Price: $1,729.99

  19. Explore Scientific - ED127 Air-Spaced Triplet Refractor Carbon Fiber Telescope

    DISCONTINUED: Explore Scientific - ED127 Air-Spaced Triplet Refractor Carbon Fiber Telescope

    This is a discontinued item. We recommend the newer version of the Explore Scientific ED127 Classic White Air Spaced Carbon Fiber optical tube as a replacement.

    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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    FREE SHIPPING
    (48 States)
    Model#: TED127075-CF
  20. Explore Scientific - ED127 Air Spaced Carbon Fiber Triplet Refractor Telescope

    Explore Scientific - ED127 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.

    ...
    Learn More
    FREE SHIPPING
    (48 States)
    Model#: EDT-127075-CF

    Regular Price: $5,556.99

    Special Price: $2,499.99

20 Item(s)

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