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Hi Bojan,
Yes that was what I did earlier too, it worked well. But now I want to take it to a higher level. No variations of the level from image to image. Sky flats have a tilted background which I want to eliminate. Most important, have the same level of each color, no one saturate and no one at too low level.
Most of my astrophotos is taken from a heavy ligth polluted sky. It's much easier to process these images if I do a flat calibration of a high quality. Then I separate what's caused by the optic and by the light pollution.
When I process my images I background subtract each sub image. It works better if the vignetting is eliminated before. Background=subtract, Vignetting=division.
Why make life easy when it can be done much more complicated. :-)
Bojan, which Borte Class do you have at your place ?
/Lars
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