when using a DSLR, I did darks on-site.
Now with a cooled cam, I do them at home, at night when there are no lights on and let it run for however long it needs to. Sometimes I cover it for extra light blocking capability, sometimes I put it in the second fridge in the garage if it's a hot day and can't get it too temp.
haven't had any issues with that yet. Flats? Yep. Flats can be tricky to get right, but darks are fine.
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