ASA 2" Reducer Corrector for ASA N-Series Astrographs

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ASA 2" Reducer Corrector for ASA N-Series Astrographs

ASA 2" Reducer Corrector

To correct the field of view on their N-Series Astrographs, ASA uses correctors designed by Philipp Keller. All correctors have sufficient backfocus to connect to all popular camera systems.

Depending on the corrector, systems can be used at f/3.6 or shortened to f/2.75. Alternatively, N-Series Astrographs can be extended to f/6.8. The photographer can decide which focal length to use, depending on the object they are imaging, the seeing conditions, and other considerations such as wind.

For example, an ASA Astrograph N 8"/f3.6 with a focal length of 730 mm can also be used at 558mm (f/2.75) or as a 1380mm, f/6.8 system. All ASA correctors are available separately and can be used with other Newtonian telescopes.

ASA 2" Reducer Corrector Specifications...
  • Corrected Field: 22mm
  • Backfocus: ca. 65 mm
ASA - AstroSysteme Austria Product Number: RC2


Accessory TypeReducer/Corrector
WarrantyNot Supplied By Manufacturer


Ask a Question
  • I'm looking for a Reducer Corrector to use on a Vixen R200ss 8" f4 Newtonian Astrograph. I want to make the scope faster for video astronomy I'm doing with my color Atik Infinity camera. Do you think the ASA 2" Reducer Corrector (your item # A2-2KORRR)

    If you can get a low enough profile 2" connection (you might need to have a machinist make one) to reach focus with this reducer, it should work well. Customers have had good luck using it with other brands of f/4 imaging Newtonians, but most of the othe

  • I've seen this used with GSO/TPO newts. However looking at ASA's datasheet it doesn't give any info on the back focus for a 8"/200mm scope. Is there formula for figuring the correct back focus respective size of the scope?

    ASA notes a nominal back focus of 65mm for any size fast Newtonian around f/3.5-f/4. A slower or smaller scope will do better a smidge closer (undercorrected) and a larger and/or faster scope will do better with the camera a bit farther (overcorrected), b