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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. 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

  2. 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

  3. 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

  4. 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

  5. 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

  6. 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

  7. 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

  8. 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

  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 - 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

  11. 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.

    ...
    Learn More
    Model#: ASA-ASA600CA

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

    $82,395.00

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