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You should be able to take darks at night with the scope cap on.
When you think of the number of nights you can't image due to clouds you could accumulate a massive amount of darks.
But this is one area where CCDs are better as CCD cameras have shutters which should block out stray light. I would still only trust them at night though.
CMOS only have electronic shutters which is good from a cost/maintenance viewpoint but not from a flats/dark viewpoint.
Greg.
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