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Seeing? Optics, Focus?, ???
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24-09-2014, 01:50 PM
Shiraz
(Ray)
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Join Date: Apr 2010
Location: ardrossan south australia
Posts: 4,918
oops, sorry Peter, I might have erred in my prior post. Thinking about how it probably works, you really need to subtract the total background, including skyglow - just taking off dark may not make much difference. Will PM.
Shiraz
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