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Gday Fred - best answer I have is operator incompetence. I've checked collimation etc so after what you have said (and I know that you know) it is probably just a product of imaging at this focal length
I just dont know but my images all appear as thought the stars are just too big and you can only pinch so many.
I usually use refractors (TV & Black Diamond ED120) and when I compare images the first thing I notice is what I would call bloated stars (bloated may be too strong a word) but they may just be normal sized stars for the focal length. So again it is probably operator incompetence.
Luke (Sry mate didnt know this was you) _ as discussed I dont know the answer re 450D. Best solution is to stick it on the scope out at Leyburn and try it. If you arent out there this weekend I will stick the 350D on and try.
I lean more to shorter focal length photography anyway so they (SCTs) are going to raise funds for a Tak Epsilon or similar.
Mark
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