Hello everyone! I recently sold off my Nikon 16mm to pay for my new D300 (which is a great deal of fun). However, I'm a sports shooter and one of my favorite sports to shoot is snowboarding. So i was wondering if any of you guys have any experiences (good and bad) with this lens as I'm considering getting it in the future. I'm also open to the idea of Sigma and Tamron lenses of equivalent size (because I'm a college student and always looking to pinch pennies) photos would be a plus. Thanks!