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Thanks Ken. It seems we are on the same track - what a relief. Perhaps the term dark-flat can be applied generically in this case, forgetting exposure time.
John. That will be good. I look forward to it. Pinpoint stars with an FS60CB. It might be time to retire the 200mm Canon.
Rowland.
Last edited by rcheshire; 20-05-2014 at 11:23 AM.
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