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I don't use bias frames. Just darks and sometimes flats.
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I don't understand why, Kevin? (unless you use Flat Darks). Bias should be subtracted from the darks, flats and lights to remove read noise. Bias frames are easy to take, and easy to apply. Why not do it?
My straightforward procedure:
1. Darks subs - Bias Master (BM), then combine to create DM (or Bad Pixel Map)
2. Flat subs - BM, combine to FM
3. (Light subs - BM - DM)/FM