Highlights

• This combination focal reducer and field corrector lens accessory works with all Celestron 5", 6", 8", 9 1/4", 11" and 14" Schmidt-Cassegrain 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, C6, C8, C9¼ and C11 telescopes and f/7 for the C14 telescope

This combination focal reducer and field corrector lens accessory works with all Celestron 5", 6", 8", 9 1/4", 11" and 14" Schmidt-Cassegrain 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, C6, C8, C9¼ 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.

The Celestron f/6.3 focal reducer/corrector requires a back-focus distance of 105mm from the end of the reducer to the imaging sensor on your camera. The example camera in this video is a Canon SL1, but this will apply to all DSLR cameras as long as you get your focal distance to 105mm. For the typical DSLR with a sensor to flange distance of 45mm, all that is needed is a 10mm T-ring and a Schmidt-Cassegrain T-Adapter (50mm).

The adapter has a SCT to SCT threads (same size on both sides)

The #94175 Reducer/Corrector Lens is not compatible with Celestron EdgeHD optical systems.