Just an add on. I just read a thread on this site saying that the lens should be in the temp. that one is shooting in for a while. Not taking it from warmth to cold, and using it right away because of condensation and the shutter getting used to the cold. I was just wondering, if I'm out shooting for the day in winter, and I pop in and out of stores, which will be nice and warm, and back out in the cold what effect, if any this has on a lens/shutter. The above thread said its more important to keep the light meter warm. I was going to keep the lens inside my coat till shooting, I guess not? With something so expensive, I just want to do the right thing. Thank you for your advise.