But I have 3 scopes and 2 reducers = many different setups and lots of different duration flats. Shooting flats with a qhy9 is a pain in the rear at the best of times never mind flat darks for all those setups, so I opted not to use them. Bias files are a lot easier to manage in my case.
So I use :
1) Lights + matching darks
2) Flats (for each filter) + Bias files
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