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Same as Rick. If you're using PI, it's dark scaling is pretty good. Dark library about 2-3 times longer exposures than the longest you normally take I think is the rule of thumb. I used 20x1800s for 1x1 bin and 20x900s for 2x2 bin for dark library and 100x biases each binning.
I'm about to redo my library as well and think this time I'll do more than 20 for the darks. The benefit of 100x biases is surprisingly good.
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