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Ray,
Four pixels per frame in a spiral pattern (that's what CCD Commander does).
4 pixels right, 4 pixels down, 8 pixels left, 8 pixels up, 12 pixels right, 12 pixels down, 16 pixels left, 16 pixels up, and so on.
Because I am refocusing every 30 minutes (my typical exposure is 7.5 minutes, as per yours/Stan Moore's algorithm), I only get to the 8 pixels up, before having to start again. But, I think there's enough variability between exposures at 3.51"/pixel, that it's good enough. Seems to be producing the goods so far.
I've been capturing RGB at bin 2x2, and hoping that dithering by a factor of 2 should suffice for registration against bin 1x1 luminance, instead of the traditional resize of the bin 2x2 frames.
H
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