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Regards a dark library, I am in the middle of shooting one for my new camera at the moment. Once you settle on a gain and a temperature you expect to use commonly you can shoot darks more profitably, there should not be a need to shoot darks for loads of different temperatures, just pick one you can probably achieve all year and shoot both lights and darks (And flats depending on length of flats) at that temp. It looks like my new ASI2600 will comfortably hold -10 sensor temperature in any reasonable ambient temperature so I am shooting 30, 60, 120, 300 and 600 second darks while I wait for some more gear to arrive. If I find that I want to use a different gain or there is a hole in my list of exposure times, I will shoot darks to suit later.
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