Another real concern is condensation that may form on or inside the camera or lens when bringing it in the house (or into a warm car) from the cold outside, just like it does on my glasses. Condensation forming inside the lens or camera could ruin it and cause all kinds of mechanical, electrical or optical problems. Before I bring my cold camera in the house I will either zip it tightly inside my camera bag or I will put it inside a "dry bag" used for keeping things dry while canoeing or kayaking and seal it up tightly (a large sealed zip-lock bag may work also). First wrapping a towel around the camera may also prevent any moisture that may form inside the plastic bag from dripping on the camera. Then, when I bring it inside I will wait several hours to let everything gradually warm up to room temperature before opening the bag. I guess I can't be in too much of a hurry to get to the photos that I just took or to recharge the batteries. Surprisingly, the same thing happens in the summer when taking a camera from the hot-humid outside in to a cold air-conditioned building. So the same steps should be taken to stabilize the temperature before exposing the camera to the colder room to avoid condensation.
Well, that is my photo-tip for the day.
- Bruce McKee