Astro-Tech Schmidt-Cassegrain f/6.3 Focal Reducer Field Flattener


Availability: More on the way

This combination f/6.3 focal reducer/corrector lens reduces the focal ratio of all Celestron 5" through 14" Schmidt-Cassegrain telescopes, as well as all Meade 8" through 16" SCTs . . .

Our Product #: ATSCTFR
Astro-Tech Product #: ATSCTFR

Product Description

This focal reducer and field flattener consists of a four-element multicoated 40mm lens in a metal cell. It threads onto the rear cell of 5” to 16” Celestron and Meade Schmidt-Cassegrain telescopes, making it possible to have a dual focal ratio instrument without sacrificing image quality. The reducer/corrector duplicates the rear cell thread of the telescope, allowing you to attach all standard rear cell visual and photographic accessories to the reducer. The reducer/corrector converts the f/10 focal ratio of Celestron C5, C8, C9¼, and C11 telescopes (and all Meade 8” and larger f/10 telescopes) to f/6.3. The f/11 C14 telescope becomes an f/7. When used for astrophotography, it reduces exposure times by a factor of 3, with an actual field diameter of 1.5” at the film plane.

A rubber grip ring on the body allows for easy installation of the reducer/corrector on your scope, even when you are wearing gloves.

Tech Details

Warranty 1 year


Review by:
I've owned and used both the Meade and Celestron FR's and have to say that the AT performed just as well. As a matter of fact the AT looks to be a rebranded Meade FR... Mine even had "series 4000" stamped on the side of it. Don't know why this FR is $65 and the Meade is $99.... (Posted on 4/17/2021)
Review by:
Bought for my CPC-925 because the Celestron model seemed unnecessarily expensive for what it was. I'm 100% satisfied - this works like a charm for both visual and AP and, like my other Astro-Tech accessories, the build quality and optical performance are on par with much more expensive options. (Posted on 10/4/2019)
Review by:
Compared to reducer/flatteners from Celestron and Meade as well as Antares, this appears to be of the same quality and build at half the price of the Celestron version. I have used it extensively with a C8 for EAA and find it invaluable for a faster system and larger FOVs when needed. Highly recommended! (Posted on 9/13/2019)
Review by:
I used to own the MEADE 4000 series focal reducer and field flattener for my 5" Celestron SC. Upon getting my portable imaging setup ready for a move I realized my old reducer had some chipped glass pieces around the thread, so I needed a replacement. Since I plan to move to a fast refractor, I needed a low cost replacement and went for the astro-tech reducer. Mechanical quality seems identical, I haven't had the chance to take it out for imaging yet. (Posted on 11/8/2018)
How do you rate this product? *