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Old 01-09-2017, 09:11 AM
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Atmos (Colin)
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Join Date: Aug 2011
Location: Melbourne
Posts: 6,980
It's more to do with image scale than focal length. For your camera something around the 1000mm range would be good. So a 8" F/5 or 10" F/4 or 12" F/3

http://www.astrobin.com/full/287438/D/
This was shot at 677mm on a night of awful seeing.
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