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Hi Tony, I notice that all the stars are elongated horizontally, so I suspect
that your P.A. is not good enough for 30 sec subs. Even with my 8" f/5
Newt at prime focus I need to be down to a max of 1' to get round stars,
and down to just a few seconds for 45-60 sec subs. As far as the coma like problem is concerned, along with the others, I think you are probably right.
raymo
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