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I just came back from a trip in the winter in Hokkaido, Japan. With certain aspects in mind and due to my personal conditions, I took a 5D Mark II and 7D. Both cameras performed extremely well without any issues the whole day in temperatures well below freezing and I carried them out using a double strap in the open.
There were times that I exposed both cameras to snow fall. At one occasion, I had to use my 5D Mark II under a fairly heavy snow fall while the 7D was left in a warm hotel room. I thought it would be a good idea to find out how far I could push the camera. Both the camera and lens were covered with snow. Although the snow was dry and I could blow that away but since the camera was handled, it melted and somehow after and hour or so, it started to become erratic, not completely out but the back AF button was not working anymore. I took it to a semi dry place under cover, tried to dry everything I could and I took the battery out. It worked normally again and I went back shooting. It lasted for about another hour and the AF button stopped working again. This time around, I could not get the image playback to work either. But I know until the last shot that it was recording because the LED was still lit after the last exposure. I put everything away and we went back to the hotel.
Once at the hotel, I dry everything more thoroughly now and I used a hair dryer at low setting to dry the crevices. To my delight, the full function of the camera was restored and it worked flawlessly for the remaining 10 days of the trip.
To sum it up, your camera gear is probably tougher and can handle more than what you think. Either that or I am a lucky enough to get away unscathed under those conditions. Chances are the first is true . Come to think of it, it was kind of daring for me to try to push the limit of what the 5D Mark II could take at a place far away from home. Although I had the 7D there on the trip but a single camera could have hampered my shooting flow where I needed both without changing lenses at various occasions.