Re: camera info
I used my Canon 300D (I think it's called a Canon Rebel in the US) at -35 degrees Celsius on Ross Island and it worked just fine. The main problem with any electronic camera gear in very cold temperatures is that battery life is much reduced - the solution is to take a couple of spares with you, keep them in an inside pocket for warmth and then swap them over when needed.
One other tip - when coming back indoors from the cold, give the camera a chance to warm back up rather than opening it up immediately, so that the risk of condensation inside the body and lens is minimised.
Hope this helps!