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All of the above work. I have also taken darks inside during the day (ambient 20 degrees) temperature matched with lights taken outside at 2 am in Winter (ambient 2 degrees) by the expedient of putting the camera in a plastic bag in the fridge. With the USB cable snaking out to the laptop on the kitchen bench.
Wife thought I was mad.
Backyard EOS tracks your sensor temp and writes it into the filename for each sub. Invaluable.
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