COLD WEATHER PROTECTION

If you are outside on a cold day, and take your gear inside to a warm humid environment, condensation can form both inside and outside your camera and lenses. This is bad enough, but if you go back out into the cold before the condensation evaporates, ice can form inside and outside your gear. This can be disastrous especially to todays sophisticated electronics. Before you enter a warm car or building, seal your equipment in a zip lock plastic bag or a tight sealing camera bag and let it warm up to room temp before you open it.

BATTERIES IN COLD WEATHER
Nothing is more frustrating than your batteries going "dead" in cold weather. They actually don't die, they just temporarilly lose power. Once they warm up, they will work fine. Make sure you carry a spare set at all times anyway, but in winter, carry them in an inside pocket, so, when your batteries lose power, you can rotate the cold ones to your pocket and the warm ones to your camera. That way you will always have power available. Just make sure you don't keep your batteries in a pocket with change, because they can short out causing a nasty burn.