janmaxim said:Minus 30 degrees Celsius with my 600D and EF-S 18-55 lens. Worked flawlessy. Also from Norway.
In such extreme temperatures, the question (nobody is likely to be able to answer here) is how much affects your shutter mechanism, i.e. how much sooner it will break due to components/lubricants being outside their meant operating range. With a Rebel it maybe won't matter that much (depending on your budget), but a 5d3 breaking is more expensive.
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