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Took a while to figure out as first you collect a series of flats and flat darks. Median combine all frames and make a master flat and master flat dark. Subtract the MFD from the MF and then bring up the median combined master light frame. You then do a "calculation" in PS, but since it doesn't have a divide function but only a multiply function you have the lights and flats in the calculation format, invert the flat and then "multiply" the inveryted flat into the light. Voila, dust bunny contraceptive - no more "bunnies" or vignetting. There's a lot in AIP about flats but it goes into the maths which I didn't want - I just wanted a simple procedure that was universally aplicable that I could control.
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