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Field flattener for Meade ACF

Started by JJM, 04/09/2012 07:09AM
Posted 04/09/2012 07:09AM Opening Post
I was perusing the new book from Willman Bell, Telescopes Eyepieces Astrographs, and see the authors have proposed a fairly simple field flattener that would improve Meade's ACF design for astrophotography. The corrector is a cemented doublet using N-SK5 and N-K5 glasses. It produces a coma and astigmatism free flat field about one degree in diameter, but with ~ 25 micron spot size.

Jim McSheehy