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Re: Coma Corrector Info For RFT's

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Posted by Robert May on June 20, 1999 16:11:20 UTC

Jim, I don't know what the radius of the Celestron 10" scope is but if it matches yours, then it will work to some degree. The problem that you run into is that the corrector's purpose is to translate optically the correction of the light wave from the flat wavefront to a wavefront that after reflection of the primary will approach the focal point as a circular wavefront shape. I have a piece of software that I got from a guy in Arizona that made a astrograph for medium format photography and modified it for windows. It takes a mirror and two lenses near the focal point and basically helps designing a Ross type null corrector. The article was several years ago in S&T. If you want it, send me an email. Ross correctors are another whole different beastie from the Schmidt correctors and now is when to make the decision. If your primary interest is in photography, you need accuracy in position rather than very small images. CCD photography is the worst of all worlds as it wants both the field accuracy and small images.

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