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Like Robin I update my library every 6 months but leave them at -20 all year round as there seems to be little to gain with the KAF 8300 by going any lower. I also only take 1 set of 10 darks for 1 x 1 and 2 x 2 bins and use these for all calbration regardless of exposure time. My max exposure is about 15 mins with the KAF 8300 so I take a set of darks with 5X that (75 mins each) then set the calibration routine up for adaptive dark subtration (scaling) so they can be used for all exposure lengths. I have found this works well giving very clean images.
Mark
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