Does anybody know if it is possible to buy a lens of some sort that you could connect to a digital video camera that you woud carry in a backpack. The lens would strap to your helmet and you could carry the larger and heavier camera in your backpack. I want to make some trail riding videos but I do not want to buy a smaller camera. I already have a sony digital camera but it is too big to wear on my head. Any ideas or links to products?