Thread: Extreme vignetting issue?
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Old 22-01-2017, 03:21 PM
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atalas
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atalas is offline 		 
Join Date: Mar 2005
Location: Sydney
Posts: 5,151
Yeah,looks like a bad flat....need to subtract a bias from light frame. Or,optics fogging up...although I don't see that on the stars.

What was the adu reading on your flat?
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