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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

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    $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

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    Regular Price: $1,899.99

    Special Price: $1,550.00

  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. Celestron - C8-A XLT (CG-5) 8" Optical Tube Assembly (OTA) - 91020XLT

    Celestron - C8-A XLT (CG-5) 8" Optical Tube Assembly (OTA) - 91020XLT

    There are three major components that make up the Star Bright XLT high transmission optical system design

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    Model#: CEL-91020-XLT

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    $825.95

  9. Celestron C8-A XLT (CGE) Optical Tube Assembly

    Celestron - C8-A XLT (CGE) 8" Optical Tube Assembly

    There are three major components that make up the Star Bright XLT high transmission optical system design

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    Model#: CEL-91024-XLT

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    $795.95

  10. Celestron - C9.25-A XLT (CG-5) 9.25" Optical Tube Assembly

    Celestron - C9.25-A XLT (CG-5) 9.25" Optical Tube Assembly

    Celestron's high quality Schmidt Cassegrain design, available in an Optical Tube Assembly.

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    Model#: 91025-XLT

    Available - Ships in 2-4 Days

    $1,195.95

  11. Celestron - C 9.25" XLT OTA w/  CGE Dovetail

    Celestron - C 9.25" XLT OTA w/ CGE Dovetail

    Celestron's high quality Schmidt Cassegrain design, available in an Optical Tube Assembly.

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    Model#: CEL-91027-XLT

    Available - Ships in 2-4 Days

    $1,195.95

  12. Celestron - C11-A XLT  (CGE) 11" Optical Tube Assembly (OTA)

    Celestron - C11-A XLT (CGE) 11" Optical Tube Assembly (OTA)

    Celestron C-11A OTA with Starbright XLT.

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    Model#: CEL-91036-XLT

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    $1,945.95

  13. Celestron C14-AF XLT (CGE) Optical Tube Assembly

    Celestron - C14-A XLT 14" Optical Tube Assembly

    The 14” Schmidt-Cassegrain Celestron C14-A XLT is the upper-end OTA of the Schmidt-Cassegrain series. The StarBright XLT coatings help improve light transmissions to ensure the highest quality images are delivered through the

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    Model#: CEL-91038-XLT

    Available - Ships in 2-4 Days

    $4,195.95

  14. Celestron - 80ED Refractor Optical Tube Assembly

    Celestron - 80ED Refractor Optical Tube Assembly

    The pinnacle of our ED scopes, this refractor is packed with great features and excellent optics. The refractor style 80ED (APO) features a 2" rack and pinion focuser and has a bracket that can adapt to a photo tripod or attach to Celestron's Advanced GT equatorial mount.

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    Model#: CEL-52280

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    $450.00

  15. Celestron EdgeHD 925 Optical Tube Assembly

    Celestron - EdgeHD 925 9.25" Optical Tube Assembly (OTA)

    The EdgeHD optical system takes all of the compact power popularized by the SCT and combines it with an improved high definition optical system for wide field, astrograph quality images.

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    Model#: CEL-91040-XLT

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    $2,299.00

  16. Celestron - EdgeHD 1100 11"  Optical Tube Assembly  91050-XLT

    Celestron - EdgeHD 1100 11" Optical Tube Assembly 91050-XLT

    EdgeHD optical system consists of a zero power corrector plate, a spherical primary mirror, and a secondary mirror along with a set of field flattening lenses integrated into the baffle..... ... Learn More
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    Model#: CEL-91050-XLT

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    $3,399.00

  17. Celestron EdgeHD 1400 Optical Tube Assembly

    Celestron - EdgeHD 1400 14" Optical Tube Assembly

    The EdgeHD optical system takes all of the compact power popularized by the SCT and combines it with an improved high definition optical system for wide field, astrograph quality images.

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    Model#: CEL-91060-XLT

    In Stock

    $5,799.00

  18. Celestron EdgeHD 800 Optical Tube Assembly

    Celestron - EdgeHD 800 8" Optical Tube Assembly (OTA)

    The EdgeHD optical system takes all of the compact power popularized by the SCT and combines it with an improved high definition optical system for wide field, astrograph quality images.

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    Model#: CEL-91030-XLT

    Available - Ships in 2-4 Days

    $1,299.00

  19. Celestron - C5 5" Spotting Scope

    Celestron - C5 5" Spotting Scope

    Celestron's C5 Spotting Scope is a 5" (127mm) aperture, 1250 mm f/10 Schmidt-Cassegrain optical system. Its optical excellence is the reason it was chosen by NASA for many space shuttle missions.

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    Model#: CEL-52291

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    Regular Price: $549.95

    Special Price: $538.95

  20. Celestron - C6-A-XLT (CG-5) 6" Optical Tube Assembly

    Celestron - C6-A-XLT (CG-5) 6" Optical Tube Assembly

    6" Schmidt-Cassegrain Optical Tube Assembly, Fastar Capable, Aluminum Optical Tube, Celestron's premium StarBright XLT coatings

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    (48 States)
    Model#: CEL-91010-XLT

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    $479.95

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