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

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.