Roger and this will apply to Fred as well I presume.
I capture the original flats in raw format, and then convert them to 16 bit Tiff format, and then combine all the converted tiffs (Medium Combine) in Image Plus, to make my master flat, which I then gray scale, with luminence and gamma in Image Plus.
The flats are captured with the camera in AV mode, on the evening sky, the darker side of sunset.
Hope this helps.
Leon
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