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Old 21-09-2016, 10:25 PM
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Atmos (Colin)
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Join Date: Aug 2011
Location: Melbourne
Posts: 6,266
Considering the short amount of time it takes to take the flats, I would definitely suggest taking flats at whatever gain setting you're using for the lights. As you're not only trying to correct for vignetting but also seniors pixel to pixel variations which may change with gain settings PLUS as the gain changes it may change thing that are unexpected. Testing is the best way though.
Suavi and Rick seem to have covered the rest pretty well
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