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I agree with all the posters. That's not a lot of vignetting. Vignetting varies a lot between types of scopes and models. Also with the size of the camera sensor. KAF8300 is not particularly big but big enough to see a drop off. Some optical designs like CDK trade off increased vignetting for faster F ratios. So the optical designer makes a choice sometimes between parameters about what characteristic is more desirable to the user.
Flats can correct some really severe vignetting. An FSQ 106ED with reducer and a 16803 camera is a miracle of flat fielding. Its really heavily vignetted.
Greg.
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