>... The star test at
>high magnification (well, 200x since that's the highest I can do right
>now!), showed only the slightest asymmetry in the diffraction pattern.

That is quite low magnification for a star test on a 10" scope. If
you see any asymmetry at all at that level you should fix it (don't
worry, it's easy :-) But it will be easier if you go to 400x or 500x.

Bill Arnett
http://www.seds.org/billa/
"Science is a way of trying not to fool yourself." -- Richard Feynman

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