I recently got the chance to go up to the Eldridge glacier to go snowboarding with my some of my friends. I have a Canon t3i and am wondering what a good lens would be for filming this trip. I was planning to have one person at the base filming whoever is snowboarding. I was hoping to be able to zoom in on the snowboarder in the beginning and interesting parts, but still be able to zoom out and get the mountain in the shot. What would be a good lens for this?