Quote:
Originally Posted by The_bluester
Just looking at your attached images there and noted you are using gain 100, I never use that for flats as I found it produced flats which corrected quite poorly. At gain 100, each electron is about 5 ADU and I found the result to look quite posterised when applied to lights and integrated.
I always do my flats at gain 0 with my 2600 cams (Both mono and OSC) and I don't aim for a specific AUD, just somewhere in the 20,000-30,000 range, so long as nothing is down near zero and nothing near saturated.
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Paul,
Thanks for your experiences
I found not matching light frame Gain to Flat frame Gain doesn’t quite correct dust donuts other similar spots etc
I use both Gain 0 and Gain 100 to capture my lights in two different locations and corresponding Gain for my Flats and Bias and found no major issues.
Although in saying that my Gain 0 calibrated images are always so much better in regard to SNR due to the Bortle 3 skies
Cheers
Martin