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Hi Mark, you have an advantage living in Tassie[ I used to live in Rosebery],
with its generally moderate to cool temperatures. I have found that if the
ambient temp when imaging widefields is below 10 deg, darks confer no significant benefit if you take at least 20-30 lights, but the benefit rapidly increases as the temp rises into the teens. I have found that if you have a good dark site, flats are of limited value.
If you take darks at the same ISO and ambient temp as the lights, then biases are superfluous as darks contain bias information.
raymo
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