The Celestron f6.3 focus reducer is an optimized accessory for Schmidt-Cassegrain telescopes. It reduces the time required to take an exposure and increases the field of view by shortening the focal length of the telescope. The f10 systems function as an f6.3 instrument without changing the size of the central aperture.
Accessory for both visual and photographic use. For photography, a sensor distance of approximately 105 mm is recommended.