Hi I am going to Tasmania at the end of June to mid July, I will be trying to shoot sunrises and sunsets with snow, one of the places we will visit is Cradle Mountain, any help on how to shoot in snow would be a great help, also how do you stop your lenses fogging up?

My gear is a Canon 7D, Canon 50mm 1.8, Canon 18-135mm, Sigma 150-500mm and Canon 20-35mm, plus remotes and filters.

Any help would be great.