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Each imaging session I am taking darks in the middle of it or at the end (while packing), usually 10-15 frames. This way I do not double the imaging time.. yes, this way I have some extra actuations (and this is considerable part of ~50,000 actuations life span of the shutter) but also slightly better S/N at the end of the day.
Building a library up front is not the same thing as taking care of this during the imaging session, when all conditions are really matched (which is the idea behind taking dark frames anyway).
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