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Adam Block suggests that darks should be stable for 3 to 6 months.
I have started to use scaling of my darks so that I can take two sets (for 1x1 and 2x2 binning) for each temperature. In future I will only be producing them at an exposure time of 1800 seconds. It will take some time to produce a reasonable dark but it can be done while I am sleeping.
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