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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. Takahashi TOA-150 Optical Tube Assembly

    Takahashi - TOA-150B Refractor Optical Tube Assembly

    The TOA-150 is the second Takahashi Ortho Apochromat to be developed by Takahashi. It features a newly designed triplet objective. This new design like its smaller companion the TOA-130 is absolutely color free

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    FREE SHIPPING
    (48 States)
    Model#: TOK1501

    Available

    $11,870.00

  2. AG Optical 10" Dall Kirkham Astrograph Telescope

    AG Optical - 10" Dall Kirkham Astrograph Telescope

    AG Optical Systems' Imaging Dall Kirkham (iDK) astrographs are high resolution, premium quality instruments with outstanding on and off-axis performance across a huge 60mm field of view.

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    FREE SHIPPING
    (48 States)
    Model#: 10IDK

    This item is special order. Delivery times will vary. Place your order today and your card will not be charged until the item ships.

    $11,495.00

  3. AG Optical 14" Imaging Harmer Wynne Astrograph

    AG Optical - 14" 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#: iHW14

    This item is special order. Delivery times will vary. Place your order today and your card will not be charged until the item ships.

    $23,975.00

  4. 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

    This item is special order. Delivery times will vary. Place your order today and your card will not be charged until the item ships.

    $27,595.00

  5. ASA - 10" f/3.8 10N Astrograph

    ASA - 10" f/3.8 10N Astrograph

    ASA, also known as Astro Systeme Austria has developed the ASA 10" F/3.8 model-10N Astrograph Optical Tube Assembly (OTA) which is an excellent starting point for the amateur astronomers who strive to do astro-imaging and wish to configure a custom system. The ASA OTA is a great example of a fast and wide field optical imaging system great for high quality imaging and also capable of working at multiple focal lengths.

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    Model#: ASA-ASA10NO3

    This item is custom made and will be made per your request. Payment is due in advance.

    $7,150.00

  6. ASA - 12" f/3.8 12N Newtonian Astrograph OTA with Accessories

    ASA - 12" f/3.8 12N Newtonian Astrograph OTA with Accessories

    ASA, also known as Astro Systeme Austria has developed the ASA 12" F/3.8 model-12N Astrograph Optical Tube Assembly (OTA) which is an excellent starting point for the amateur astronomers who strive to do astro-imaging and wish to configure a custom system. The ASA OTA is a great example of a fast and wide field optical imaging system great for high quality imaging and also capable of working at multiple focal lengths.

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    Model#: ASA-ASA12NO3

    This item is custom made and will be made per your request. Payment is due in advance.

    $9,750.00

  7. ASA - 16" f/3.8 16N Newtonian Astrograph OTA with Accessories

    ASA - 16" f/3.8 16N Newtonian Astrograph OTA with Accessories

    ASA, also known as Astro Systeme Austria has developed the ASA 16" F/3.8 model-16N Astrograph Optical Tube Assembly (OTA) which is an excellent starting point for the amateur astronomers who strive to do astro-imaging and wish to configure a custom system. The ASA OTA is a great example of a fast and wide field optical imaging system great for high quality imaging and also capable of working at multiple focal lengths.

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    Model#: ASA-ASA16NO3

    This item is custom made and will be made per your request. Payment is due in advance.

    $18,595.00

  8. ASA - 400mm f/8 Ritchey-Chretien Telescope - Open Truss Tube

    ASA - 400mm f/8 Ritchey-Chretien Telescope - Open Truss Tube

    ASA has developed a fantastic line of high quality Ritchey-Chretien Telescopes perfectly geared for extensive research or high level astro-imaging. The ASA 400mm f/8 is a fast high quality optical system that uses a hyperbolic primary mirror to form the image behind the cell and uses the secondary mirror for focusing by moving it along its axis via a computerized electrical drive system. These optical systems are similar to Cassegrains, but has improvements in the field correction even without a field-flattener lens being used.

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    Model#: ASA-ASA400RC

    This item is custom made and will be made per your request. Payment is due in advance.

    $36,595.00

  9. ASA - 400mm f/9 Cassegrain Telescope - Open Truss Tube

    ASA - 400mm f/9 Cassegrain Telescope - Open Truss Tube

    ASA has developed a fantastic line of high quality Cassegrain Telescopes perfectly geared for extensive research or high level astro-imaging. The ASA 400mm f/9 is a fast high quality classical optical system that uses a perforated parabolic primary mirror to form the image behind the cell and uses the hyperbolic secondary mirror for focusing by moving it along its axis via a computerized electrical drive system.

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    Model#: ASA-ASA400CA

    This item is custom made and will be made per your request. Payment is due in advance.

    $33,595.00

  10. ASA - 500mm f/8 Ritchey-Chretien Telescope - Open Truss Tube

    ASA - 500mm f/8 Ritchey-Chretien Telescope - Open Truss Tube

    ASA has developed a fantastic line of high quality Ritchey-Chretien Telescopes perfectly geared for extensive research or high level astro-imaging. The ASA 500mm f/8 is a fast high quality optical system that uses a hyperbolic primary mirror to form the image behind the cell and uses the secondary mirror for focusing by moving it along its axis via a computerized electrical drive system. These optical systems are similar to Cassegrains, but has improvements in the field correction even without a field-flattener lens being used.

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    Model#: ASA-ASA500RC

    This item is custom made and will be made per your request. Payment is due in advance.

    $55,995.00

  11. ASA - 500mm f/9 Cassegrain Telescope - Open Truss Tube

    ASA - 500mm f/9 Cassegrain Telescope - Open Truss Tube

    ASA has developed a fantastic line of high quality Cassegrain Telescopes perfectly geared for extensive research or high level astro-imaging. The ASA 500mm f/9 is a fast high quality classical optical system that uses a perforated parabolic primary mirror to form the image behind the cell and uses the hyperbolic secondary mirror for focusing by moving it along its axis via a computerized electrical drive system.

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    Model#: ASA-ASA500CA

    This item is custom made and will be made per your request. Payment is due in advance.

    $50,995.00

  12. ASA 600mm f/8 Ritchey-Chretien Telescope Open Truss Tube

    ASA - 600mm f/8 Ritchey-Chretien Telescope - Open Truss Tube

    ASA has developed a fantastic line of high quality Ritchey-Chretien Telescopes perfectly geared for extensive research or high level astro-imaging. The ASA 600mm f/8 is a fast high quality optical system that uses a hyperbolic primary mirror to form the image behind the cell and uses the secondary mirror for focusing by moving it along its axis via a computerized electrical drive system. These optical systems are similar to Cassegrains, but has improvements in the field correction even without a field-flattener lens being used.

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    Model#: ASA-ASA600RC

    This item is custom made and will be made per your request. Payment is due in advance.

    $91,395.00

    Out of stock

  13. ASA - 600mm f/9 Cassegrain Telescope - Open Truss Tube

    ASA - 600mm f/9 Cassegrain Telescope - Open Truss Tube

    ASA has developed a fantastic line of high quality Cassegrain Telescopes perfectly geared for extensive research or high level astro-imaging. The ASA 600mm f/9 is a fast high quality classical optical system that uses a perforated parabolic primary mirror to form the image behind the cell and uses the hyperbolic secondary mirror for focusing by moving it along its axis via a computerized electrical drive system.

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    Model#: ASA-ASA600CA

    This item is custom made and will be made per your request. Payment is due in advance.

    $82,395.00

  14. ASA 8" 8H Astrograph Hyperbolic Primary with 3" Focuser - OTA Only

    ASA - 8" 8H Astrograph Hyperbolic Primary with 3" Focuser - OTA Only

    The ASA 8" 8H Astrograph Hyperbolic Primary with 3" Focuser uses a hyperbolic primary mirror. With high quality and low expansion Suprax primary and secondary mirrors (P/V <1>97% reflectivity) and with their own interferogram, the ASA astrographs are an astrophotographers dream! To make collimation easier for the user, ASA has implemented a centered triangle reference mark on the primary mirror.

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    Model#: ASA-ASA8HOK3ZK

    This item is custom made and will be made per your request. Payment is due in advance.

    $9,895.00

  15. ASA Newtonian Astrograph Optical Tube Assembly

    ASA - 8" f/3.8 8N Newtonian Astrograph OTA with Accessories

    ASA, also known as Astro Systeme Austria has developed the ASA 8" F/3.8 model-8N Astrograph Optical Tube Assembly (OTA) which is an excellent starting point for the amateur astronomers who strive to do astro-imaging and wish to configure a custom system. The ASA OTA is a great example of a fast and wide field optical imaging system great for high quality imaging and also capable of working at multiple focal lengths.

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    Model#: ASA-ASA8NO3

    This item is custom made and will be made per your request. Payment is due in advance.

    $5,850.00

  16. Astro-Tech Black 72mm f/6 ED Doublet Refractor OTA

    Astro-Tech - Black 72mm f/6 ED Doublet Refractor OTA

    Astro-Tech has built this optical tube by increasing their previous aperture of 66mm to a now 72mm. This allows 9% higher resolution and 19% better light gathering. In addition, a new and updated focuser has been supplied with this telescope.

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    (48 States)
    Model#: AT72BK

    This item typically has a delivery time of 4-6 weeks. Place your order today to reserve.

    $399.00

  17. Astro-Tech - Blue 72mm f/6 ED Doublet Refractor Optical Tube Assembly

    Astro-Tech - Blue 72mm f/6 ED Doublet Refractor Optical Tube Assembly

    Astronomy magazine called this scope’s predecessor, the 66mm Astro-Tech AT66ED, “a product everyone should own.”

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    (48 States)
    Model#: AT72BL

    This item typically has a delivery time of 4-6 weeks. Place your order today to reserve.

    $399.00

  18. Astro-Tech Green 72mm f/6 ED Doublet Refractor Optical Tube Assembly

    Astro-Tech - Green 72mm f/6 ED Doublet Refractor Optical Tube Assembly

    This green optical tube from Astro-Tech is a piece of equipment every advanced serious astronomer should consider. With high quality refractive optics, fabulous accessories, it is pretty amazing.

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    (48 States)
    Model#: AT72GR

    This item typically has a delivery time of 4-6 weeks. Place your order today to reserve.

    $399.00

  19. Astro-Tech - White 72mm f/6 ED Doublet Refractor Optical Tube Assembly

    Astro-Tech - White 72mm f/6 ED Doublet Refractor Optical Tube Assembly

    Astronomy magazine called this scope’s predecessor, the 66mm Astro-Tech AT66ED, “a product everyone should own.”

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    FREE SHIPPING
    (48 States)
    Model#: AT72WH

    This item typically has a delivery time of 4-6 weeks. Place your order today to reserve.

    $399.00

  20. Borg - 300mm/F4.5 Fluorite Telephoto Lens Set (White) - *Picture shows camera. This product does NOT include the camera, it only includes the optical tube assembly components.

    Borg - 300mm/F4.5 Fluorite Telephoto Lens Set (White)

    300mm/F4.5 Fluorite Telephoto Lens Set (white) includes 2567, 7861, 7603, 2 x 7602, and 7000

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    (48 States)
    Model#: 6267

    Available

    $995.00

Items 1 to 20 of 236 total

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