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I don't do flat fielding in Neb 2. I do all my calibration in CCDStack but the process would be similar in Neb or DSS I'd assume. I target 9000ADU for my flats in the brightest part. I stack 40 of them to make the master. You'll also need to shoot 40 bias frames to make a master bias. You need the bias frame when you divide your master flat into each of your subs. Otherwise your flat will over/under correct and you may get inverse vignetting or darker or brighter dust bunnies. HTH.
PS: Forgot to mention - all calibration is to be carried on prior to debayering. There is not gain debayering then flat fielding each channels. You get the same result for 2 times the amount of work.
Last edited by multiweb; 10-09-2009 at 12:27 PM.
Reason: Debayering
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