The icy snap around the corner will no doubt provide some cracking opportunities for some top shots -but what precautions should I take when using my camera in freezing conditions? I have a canon 500D and use a sigma 150 - 500mm lens for wildlife photography. My main concern is taking it from a warm house out into freezing temperatures and vice versa. My glasses always steam up, so I'm guessing the camera and lenses will do the same? I don't feel comfortable with the insides of them getting condensation build up! Any advice, or am I worrying unduly??