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Focal Reducer for Celestron Nexstar 8 SE


valleyman

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It's a flattener-reducer, to be precise. Beware of using it visually. It will not open out the field any more than a widefield 2 inch EP with 2 inch back. If you already have these then the baffle tube will impose the final field stop.

Olly

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Reducer/Corrector f/6.3 

This combination focal reducer and field corrector lens accessory works with all Celestron 5", 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, 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. Then you have a fully corrected "rich field" with a diameter of 24 mm, free of vignetting.

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.

/T
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Hey Pat.

I have the Celestron Evolution 6" (i think its nearly identical to the SE version, just the mount is new) and i have that flattener/reducer. I highly suspect it will also work for the SE as the threading is the same.

Not sure about 8" though.

Regards, Graem

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