Flat haven't zapped this yet, in fact in using Deep Sky Stacker (for years now) something very weird is going on with with my processing.
I created the BIAS, flat whites, flat darks and darks several days ago and made masters, but when I stack good light frames everything becomes really faded. The histogram is all the way to the left and on say the Triffid - only the stars can be seen, even the nebulae is lost!
Will try again and see if its the flats or the darks (or something else) that is removing all the nebulae detail!
PS
It's definitely the darks that loose all the detail! I stacked four shots of M20 - 480 secs, 600 secs, 900 secs and 1200 secs - all fine. Added BIAS - all fine. Added Flat White - better still. Added Flat dark - improved. Added single 480 Sec master dark - all went to hell - light curves shifted to the far left and blue got ultra wide. Tried again and used just a singe 480 sec dark CR2 (raw) file - still very wonky and violet shifted.
Last edited by g__day; 28-06-2015 at 03:01 PM.
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