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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. Opticstar AR80S Gold DS 80mm f/5 Apochromat Refractor Guidescope

    Opticstar - AR80S Gold 80mm f/5 Achromatic Refractor Guidescope with Rings, Dovetail, and Crayford Focuser

    The AR80S Guidescope kit consists of the Opticstar AR80S telescope, set of collimating rings and Vixen type dovetail to mount the telescope to standard mount saddles as found on the Sky-Watchers, Celestron CG-5, Vixen and other mounts.

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    (48 States)
    Model#: OSRAR80SGS

    Regular Price: $399.00

    Special Price: $379.05

  2. Lunt Engineering 70mm ED Doublet OTA

    Lunt Engineering - 70mm ED Doublet OTA

    A new optical tube by Lunt, the 70mm ED Doublet!

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    Model#: LE70OTA
    $399.00

  3. 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

    The latest addition to the Air-Spaced Doublet AR Series is the very portable, grab-and-go 102mm! Like its two larger brothers, the AR127,

    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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    Model#: DAR102065-00
  4. Opticstar AR90S Gold DS 90mm f/5.5 Apochromat Refractor OTA

    Opticstar - AR90S Gold DS 90mm f/5.5 Apochromat Refractor Optical Tube Assembly

    The Opticstar AR90S Gold Dual Speed short-tube refractor is ideal as a portable scope and can be used for observing, imaging or as a guide scope. It uses a 90mm achromatic doublet that is fully broad-band multicoated to increase light transmission.

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    Model#: OSRAR90S5GD

    Regular Price: $459.00

    Special Price: $436.05

  5. Lunt Engineering 80mm ED Doublet OTA

    Lunt Engineering - 80mm ED Doublet OTA

    The Lunt 80mm ED Doublet OTA comes with fully multi-coated lenses that can be used for both night time and solar observing (with a solar filter!), depending on your choice.

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    Model#: LE80OTA
    $449.00

  6. Celestron - Omni XLT 120 OTA

    Celestron - Omni XLT 120 OTA

    Globular clusters, close binary star pairs, lunar and planetary images, will delight and amaze you! ... Learn More
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    (48 States)
    Model#: 21090-1
    $499.00

  7. 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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    Model#: DAR127065-00
  8. Vixen ED80Sf Apochromatic Optical Tube Assembly

    Vixen - 80mm ED80Sf (f/7.5) ED Apochromatic Optical Tube Assembly

    The ED 80SF was initially listed as an entry level APO, but now with so many astronomers giving us such glowing reviews, it appears that we will need to reclassify this product!

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    Model#: 2617
    10% sale while supplies last!

    Regular Price: $599.00

    Special Price: $539.10

  9. Celestron - C5 Spotting Scope

    Celestron - C5 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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    (48 States)
    Model#: 52291
    $549.95

  10. Borg - 60mm ED f/5.8 (350mm FL) Optical Tube

    Borg - 60mm ED f/5.8 (350mm FL) Optical Tube

    Mini Borg scopes may be mounted directly with a 1/4"-20 threaded screw into the standard mounting block (left), or in an available finder bracket.

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    Model#: 6260
    $575.00

  11. Celestron - C6 Acromat Refractor Optical Tube Assembly (for CG-5)

    DISCONTINUED: Celestron - C6 Acromat Refractor Optical Tube Assembly (for CG-5)

    This is a discontinued item. We suggest the C6 Achromat Refractor OTA as a replacement.

    An excellent choice for the serious astronomer, the C6-R is the largest telescope in its class with over 6 times the light gathering ability of a 60mm

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    (48 States)
    Model#: 21020-OTA
  12. 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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    Model#: ES-ED0806-00
  13. Vixen - ED80Sf 80mm ED Apochromatic Refractor Telescope OTA with Rings and Dovetail Plate and Focuser --- Comes ONLY with Ring and Dovetail

    Vixen - ED80Sf 80mm ED Apochromatic Refractor Telescope OTA with Rings and Dovetail Plate and Focuser --- Comes ONLY with Ring and Dovetail

    The ED 80SF was initially listed as an entry level APO, but now with so many astronomers giving us such glowing reviews, it appears that we will need to reclassify this product! The ED80Sf refractor features high-grade glass and quality components

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    (48 States)
    Model#: 5861
    10% off while supplies last!

    Regular Price: $699.00

    Special Price: $629.10

  14. Meade 80mm Series 5000 ED APO Optical Tube Assembly

    DISCONTINUED: Meade - 80mm Series 5000 ED APO Optical Tube Assembly

    This is a discontinued item. We recommend the Meade 6000 80mm OTA as a replacement.

    The Series 5000 80 mm Triplet ED APO OTA from Meade is a 3-element apochromatic refractor telescope with an aperture of 3.1" and a focal length of 480 mm.

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    (48 States)
    Model#: 1306-00-01
  15. Sky-Watcher USA - ProED 80mm Doublet APO Refractor

    Sky-Watcher USA - ProED 80mm Doublet APO Refractor

    Due to their unobstructed textbook-like diffraction patterns and exotic optical properties, the ED-APO produces the sharpest, highest quality imaging obtainable from any telescope optical design.

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    (48 States)
    Model#: S11100
    $649.00

  16. Celestron C6-A-XLT (CG-5) Optical Tube Assembly

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

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

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    (48 States)
    Model#: 91010-XLT
    $649.95

  17. Orion - 100mm ED Refractor Optical Tube Assembly

    DISCONTINUED: Orion - 100mm ED Refractor Optical Tube Assembly

    Recently, Astronomy magazine ran a "buyer's guide" to portable 4" apochromatic refractors. All were impressive scopes, no doubt. But considering their price tags, which ranged from $2,695 (yes, that was the cheapest) to $3,595, you'd be excused if you didn't run right out and throw down your credit card for one. Here's something more practical: our 100mm ED apochromatic refractor.

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    Model#: 09975
  18. Vixen - 100mm ED100Sf (f/9) ED Apochromatic Refractor Telescope Optical Tube Assembly - (Dual focuser) --- Comes ONLY with ring and dovetail

    Vixen - 100mm ED100Sf (f/9) ED Apochromatic Refractor Telescope Optical Tube Assembly - (Dual focuser) --- Comes ONLY with ring and dovetail

    100Sf is now available for the first time in the US. It is the big brother of our best selling ED80Sf. This APO refractor features high-grade glass and quality components. Coupled with a medium f/9.0 Dual Focuser

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    (48 States)
    Model#: 5862

    Regular Price: $999.00

    Special Price: $699.00

  19. 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

    For a Great Deal Also Consider : DAR127065-00

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    (48 States)
    Model#: DAR127065-01

    Regular Price: $1,556.99

    Special Price: $699.99

  20. Meade - 80mm Series 5000 ED APO OTA Only with 3 Year Sky Assurance

    DISCONTINUED: Meade - 80mm Series 5000 ED APO OTA Only with 3 Year Sky Assurance

    This is a discontinued item. We recommend the Meade 6000 80mm OTA as a replacement.

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    (48 States)
    Model#: 1306-00-01_SKY

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