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Every CCD frame taken includes the Bias....
I've been following the recommendations given in the AstroArt guide (p135) since moving into CCD work.
-Subtract a (master) dark frame a 5-10 image stack ( average or median combine) at the same temp and exposure as the lights.
- Divide by a (master) flat field (also corrected with it's own dark frame), a 5-10 image stack ( average or median combine)
This does away with the need for separate Bias frames (unless you're trying to scale your darks ie use a stack of ten minute darks to replicate a 40min exposure......)
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