Keeping a camera in a car
Your biggest problem, apart from theft, will be condensation. This caused by temperatures having different Dew Points. This is a complicated subject as at the same percentage humidity of say 70% at 25 degrees C the air will be holding far more water than at 5 degrees C at 70%. The same principle would apply at say minus 25 & minus 5, so the temperature difference in more important than the actual temperature. This is a very simplisitc explanation, as under certain rarer conditions the reverse could be true. It does not help if you are using air con in the car. It could help if you kept the camera in an air tight freezer bag and then wrapt this in a piece of old blanket. Going from a higher temperature to lower, generally speaking, should not be a problem, going from lower to higher you should leave the camera in the air tight bag for approx 10 minutes, near to some heat souce if possible. Placing on a warm car bonnet or in the sun will suffice outdoors, in the region of a radiator when going indoor will be OK. I sometimes run a hair drier over my camera, at a low setting and at a distance, when bringing it back into the house, maybe a cheap one working off the cigarette plug would be an idea. Condesation, Dew points and temperature are interactive making the subject very complicated. As a rule of thumb hot to cold OK, cold to hot beware
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