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eheathIt is happening because you're going from cold to warm very quickly, creating condensation on the glass of your lens. This is basically unavoidable, the fog will go away if you warm up your gear or like you said taking it back outside would help the fog go away too. The best thing to do is make sure you leave your camera/lens out of your bag after skiing so that it completely dries out, but overall this is a pretty normal thing for everyone filming/photoging skiing.