Humayun I beg to differ from what I've read a lot of imagers collect at least the same number of darks to lights and some even use up too twice the number of darks too their lights
Moreso the darks must be gathered under the same conditions and temperature as the lights
With mulitple exposures of varying length you can stack in DSS as long as the darks correspond to the expsoure time of the lights
ie: 10 x 1 minutes lights (exposures)
the 10 x 1 minutes darks
then 10 x 5 minute lights
then 10 X 5 minute darks etc
once set of flats can be used multiple times
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