I'm currently looking to buy a lens for a Canon Rebel XS and for use on a T1i later on. The first mission for this lens is going to be night time open air stadium shooting. My main question is would a Canon EF 70-200mm f/4.0 L USM Lens be good enough for this purpose. Canon EF 70-200mm f/4.0 L USM Lens Review Also, how far away can you be from a person and still see facial expressions? I'm looking at being in the bottom section of the stadium at the moment. Edit: This is gonna be a monster truck show, so the lens will be on Auto-Focus most of the time as well.