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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. AG Optical 16" Imaging Harmer Wynne Astrograph

    AG Optical - 16" Imaging Harmer Wynne Astrograph

    Imaging Harmer Wynne (iHW) astrographs are high resolution, fast focal ratio instruments with excellent on and off axis performance.

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    (48 States)
    Model#: iHW16
    $27,595.00

  2. Borg Series 45 Optical Tube Black

    Borg - Series 45 Optical Tube - Black

    The Borg Series 45 telescopes are based around a 45mm diameter tube and the 42mm/P1 thread used on the popular M42 photographic system.

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    (48 States)
    Model#: 6037
    $335.00

  3. Borg Series 45 Optical Tube - White

    Borg - Series 45 Optical Tube - White

    The Borg Series 45 telescopes are based around a 45mm diameter tube and the 42mm/P1 thread used on the popular M42 photographic system.

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    Model#: 6036
    $315.00

  4. 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
    $1,729.99

  5. 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.

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

  6. Officina Stellare - RiDK 305 Riccardi Dall-Kirkham Optical Tube Assembly

    Officina Stellare - RiDK 305 Riccardi Dall-Kirkham Optical Tube Assembly

    Almost everyone knows about the high level of innovation and technology that comes with any OS products, it's clear at first sight.

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    Model#: RIDK 300
    $24,873.00

  7. ASA - 200mm Hyperbolic Astrograph

    ASA - 200mm Hyperbolic Astrograph

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    Model#: 8HSOK3ZK
    $11,235.00

  8. TeleVue - TV-85 Evergreen  85mm, f/7, APO (Doublet) Refractor

    TeleVue - TV-85 Evergreen 85mm, f/7, APO (Doublet) Refractor

    With APO performance and airline portability, the Tele Vue-85 has been delighting astronomy and birding enthusiasts and reviewers alike. ... Learn More
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    Model#: GXF-3371

    Regular Price: $2,350.00

    Special Price: $2,195.00

  9. Meade - 16" ACF Advanced Coma-Free (f/8) Optical Tube Assembly - (UHTC)

    Meade - 16" ACF Advanced Coma-Free (f/8) Optical Tube Assembly - (UHTC)

    Building on Meade’s award-winning Advanced Coma-Free (ACF) optics

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    Model#: 1608-80-00
    $9,999.00

  10. Meade - 14" ACF Advanced Coma-Free (f/8) Optical Tube Assembly - (UHTC)

    Meade - 14" ACF Advanced Coma-Free (f/8) Optical Tube Assembly - (UHTC)

    The Meade Instruments 14" f/8 ACF Optical Tube Assembly (OTA) features a 14” aperture, f/8 optical system with Meade’s Advanced Coma Free (ACF) optics and high-contrast baffling that ensures crisp, pinpoint imaging to the very edge of the field.

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    Model#: 1408-80-00
    $5,999.00

  11. Meade - 12" ACF Advanced Coma-Free (f/8) Optical Tube Assembly - (UHTC)

    Meade - 12" ACF Advanced Coma-Free (f/8) Optical Tube Assembly - (UHTC)

    The Meade Instruments 12" f/8 ACF Optical Tube Assembly (OTA) features a 12” aperture, f/8 optical system with Meade’s Advanced Coma Free (ACF) optics and high-contrast baffling that ensures crisp, pinpoint imaging to the very edge of the field.

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    Model#: 1208-80-00
    $3,499.00

  12. Meade - 10" ACF Advanced Coma-Free (f/8) Optical Tube Assembly - (UHTC)

    Meade - 10" ACF Advanced Coma-Free (f/8) Optical Tube Assembly - (UHTC)

    Building on Meade’s award-winning Advanced Coma-Free (ACF) optics, the 12" OTA employs a fast f/8 optical system with high-contrast baffling that insures crisp, pinpoint imaging to the very edge of the field

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    (48 States)
    Model#: 1008-80-00
    $2,499.00

  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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    (48 States)
    Model#: EDT-0806-CF
    $1,149.99

  14. Takahashi Mewlon 250CRS Dall-Kirkham OTA

    Takahashi - Mewlon 250CRS Dall-Kirkham Optical Tube Assembly

    When Takahashi developed the Mewlon Correctors it meant any Mewlon-250 or 300 ever made could be converted into a flat field corrected telescope.

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    Model#: TLK2502
    $9,250.00

  15. Takahashi Epsilon 130D Astrograph

    Takahashi - Epsilon 130D Astrograph

    Takahashi introduced their Epsilon Series flat-field hyperbolic astrographs in the middle 1980’s. The Epsilon-130 was the smallest aperture and most portable of the series. Now Takahashi is re-introducing the new ε-130D digital version of this astrograph.

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    Model#: TEK1310
    $2,995.00

  16. Opticstar Optimum One ED80S Gold OTA with PX-35C Planetary Camera - Color

    Opticstar - "Optimum One" Series - ED80S Gold + PX-35C Colour Planetary Camera

    The Opticstar ED80S short-tube refractor is ideal as a portable scope and can be used for observing, imaging or as a guide scope. It uses a high quality 80mm apochromatic doublet that is fully broad-band multicoated to ensure maximum light transmission.

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    Model#: ED80S + PX-35C

    Regular Price: $1,098.00

    Special Price: $1,043.10

  17. Opticstar - "Optimum One" Series - ED80S Gold + PL-131M Monochrome Planetary Camera

    Opticstar - "Optimum One" Series - ED80S Gold + PL-131M Monochrome Planetary Camera

    The Opticstar ED80S short-tube refractor is ideal as a portable scope and can be used for observing, imaging or as a guide scope. It uses a high quality 80mm apochromatic doublet that is fully broad-band multicoated to ensure maximum light transmission.

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    Model#: ED80S + PL-131M

    Regular Price: $1,148.00

    Special Price: $1,090.60

  18. Opticstar - "Optimum One" Series - ED80S Gold 80mm ED Fluorite Doublet Refractor with SL-131C Colour Planetary Camera

    Opticstar - "Optimum One" Series - ED80S Gold 80mm ED Fluorite Doublet Refractor with SL-131C Colour Planetary Camera

    The Opticstar ED80S short-tube refractor is ideal as a portable scope and can be used for observing, imaging or as a guide scope.

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    (48 States)
    Model#: ED80S + SL-131C

    Regular Price: $998.00

    Special Price: $948.10

  19. 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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    Model#: OSRAR80SGS

    Regular Price: $399.00

    Special Price: $379.05

  20. Opticstar AR80S Gold DS 80mm f/5 Apochromat Refractor Optical Tube Assembly

    Opticstar - AR80S Gold DS 80mm f/5 Apochromat Refractor Optical Tube Assembly

    The Opticstar AR80S 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 80mm achromatic doublet that is fully broad-band multicoated to increase light transmission.

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    (48 States)
    Model#: OSRAR80SGD

    Regular Price: $399.00

    Special Price: $379.05

Items 21 to 40 of 179 total

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