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T-shirt flats problem.. Help?
Heres a stretched master flat frame taken today, 4 sec duration...
I tried many different duration flat frames (0.2s, 0.8s, 1s, 2s and 4s), and I've taken flat-darks for each set. All the different durations looked largely the same, and they do nothing but introduce noise to my final image.. The dont seem to remove dust spots or lessen the vignetting at all.. They just add noise...
Any thoughts?
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