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Hi Mark,
The image looks a little soft for something taken through such a big scope.
I've attached a similar region taken through my 8" RC, the 20" should blow this away.
It's either focus or it's seeing, one of these you can do something about. Pick a reasonably bright star and spend ten to twenty minutes ensuring that you have indeed got focus, then move to the field, take a short exposure and check all the stars across the field for focus issues. Remember that the RC has a curved field, so some compromise will probably be made. Usually the seeing at my place makes this a mute point.
Cheers
Stuart
Last edited by rat156; 12-06-2010 at 08:48 AM.
Reason: Added the picture, Doh!
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