Originally posted by Doundounba I'm worried about condensation, especially when coming back indoors with a very cold camera. Any thoughts?
I think this is the main thing. Put the camera (and lenses) in an airtight plastic bag when coming into a warmer place and leave it until it becomes room temperature on its own. Usually the plastic bag will change size when this happens, which is normal. Prepare the bag ahead of time and make sure your camera and lens(es) will fit. If you are using filters, don't screw them on too tight, since the temperature change is also a pressure change and it make the filter get stuck. This is nothing major, just an inconvenience, especially if you are using a thin filter (or rotating CPL).
When you are outside, you might want to shield the camera a little. I've been to Montreal, and I remember it as windy and cold