This is not an advertisement for Reconyx, you can all make up your own minds about their camera traps but I thought this was pretty interesting. Last week I set a HC800 in the forest overnight to see what was moving around the lodgings I was staying at in the Grand Canyon National Park. Overnight it snowed 2-3 inches and went down to -5 degrees Celsius, and when I retrieved the camera in the morning this is what I found.
To my amazement I took the camera back to my room and assumed the components would be frozen and so I didn't open it to turn it off so as to avoid any moisture getting inside the camera. When it finally did thaw out and I could open the casing, I was flabbergasted to see that the camera had been taking photos even when the Fresnel lens was frozen over. Obviously the images were not clear but it was pretty impressive to see the camera trap was still able to detect movement despite the ice and snow !