Quote:
Originally Posted by Bassnut
What do you mean by "better results", if you have vignetting, then the flats should show this, so that it can help fix it in the light exposure. The more vignetting, dust motes etc showing in the flat the better, its supposed to image the faults. The worse flats you can get is a uniform grey with no imperfections, thats useless, waste of iime, and of no "correction" value at all.
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I think what Doug means is that if your flat is underexposed then by the time you subtract the bias and divide it in your light it will overcorrect so pushing the ADU in your flat yields different results. Of course if you push them too hard then you lose all the gritty details and dust but I still think the sweet spot is not the same for different setups and FL/aperture combinations. Otherwise the levels we tried would work for everything and they're not?
