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Ivo and Marc. Thanks for taking the time to comment. The method is called superbias. I confess, it's a Pixinsight module that takes a master bias and emulates a bias of hundreds perhaps thousands of frames.
I notice that the same data calibrated with a conventional bias doesn't show the same detail. Perhaps the pedestal needs increasing.
The Bayer appearance is a consequence of the superbias subtraction - it's very flat, except for the chequered appearance. Not sure what you think Ivo but areas of high saturation seem less affected.
Imaging details - Canon 1000D, sensor cooled to 7C, Astrodon spectrum enhanced. 46 x 2.5 minutes, 200mm, f4, ISO800. Bias and flats - no darks.
If the weather holds I hope to add a couple of hours to it. Although I'm not happy with tracking and focus. Looking at making a Carey Mask.
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