 be difficult to access, for example, on the top of a tall pole.
The noise produced by a camera changes over time so you'll want to take new darks
whenever you notice "too much" noise.
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Some people put their camera in the freezer before taking darks,
then take darks until the camera is fully warmed.
If that's not possible, take darks a few times a year when the temperature changes.
The goal is to have a range of temperatures,
but it's not critical to have EVERY possible temperature.
A 2 or 3 degree 