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Hi Lee,
When I was recently reevaluating my workflow it has been pointed out to me that there is a tool in PI that will generate noise free SuperBias from a MasterBias, and it worked very well for me. Taking a similar approach to MasterDark- I carefully experimented with noise reduction for my MasterDark and although I have not actually measured differences in the final image, it seems that it has not hurt my lights. Some would argue that only subtracting Bias is useful and that Darks are not needed, but my camera produces very faint gradients in longer darks (possibly due to some temperature variations across the CCD or amp glow?). Although these gradients are not showing up in light frames (only about 10-15 ADUs variations across the image in a 15-minute exposure ), I still like to do everything I can to eliminate any extra signal introduced by the camera (and the optical train with flats).
When I get time I will measure differences are report here.
S.
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