I'm going to start mountain climbing and I will be (obviously) taking tons of photos up there. I currently have: A d50, sigma 17-80, nikon 50, nikon 70-300. I think my lenses should be fine as far as getting the composition I want and everything. My questions: 1) How will that gear stand up to the elements? I know a d200 would be better, but that's not going to happen. What can I do to be careful with it? I've heard of putting the gear in a bag when coming out of the cold. If I forget to do that, will it hurt the camera or only make it shoot poorly for awhile? 2) What other gear do I need to bring? I plan on having 3 fully charged batteries (longest climbing trip should be 3 days), about 4 or 5 1gb cards, some kind of padded bag/protective case, tripod, remote, polarizing filters. I know an extra body is recommended, but that isn't happening either. We are going in spring and summer, but should still see temps around zero degrees farenheit.