Celestron Reducer Correctror, f/6.3 -

This combination focal reducer and field corrector lens accessory works with all Celestron C5, C8, C 9.25, C11 and C14 telescopes. This clever accessory makes it possible to have a dual focal ratio instrument, without sacrificing image quality. The Reducer/Corrector is f/ 6.3 for C5, C8, C 9.25 and C11 telescopes and f/7 for the C14 telescope. If offers wide fields of view with any Schmidt-Cassegrain telescope. Used for astrophotography, it reduces exposure time by a factor of 3. Celestron doesn't offer a f/ 6.3 Schmidt-Cassegrain telescope, because the design is impractical, with a large central obstruction, and resulting loss in contrast.

This, added to the inability to utilize longer focal ratios for certain objects, led Celestron to design the four-element, fully multicoated f/ 6.3 Reducer/Corrector. Results are amazing both visually and photographically.