[ATM] Re: Aplanatic Gregorian

["lou krajci" <loukrajci@comcast.net>]

>From: Mauritz Andersson <mauritz@physi.uni-heidelberg.de>

>Yes one can think of such ("compensating") designs if one gives up the
>coma-free condition. One can lower the conic constant of the primary to
>get to a reasonable null focal distance (see the formulas in the post by
>vladimir)....

>BUT, I would advise against this design since the coma is pretty
>severe...

Question.  Could you still use a 10 or 15 arcminute diameter field for CCD
imaging?  (Not necessary for perfect images...let's say for aperture
photometry in not-crowded star fields...so some aberrations are tolerable if
they don't increase star size too much above about 3 - 5 arc seconds in
diameter.

Thanks in advance.

Tom Krajci
Albuquerque, New Mexico
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