Hi all - first post, thanks for being gentle. I'm shooting a charity sports event at a fairly well-lit field for work. I have the Canon 24-105 f/4 and a borrowed 70-200 f/2.8 ii at my disposal, to pair with my 7D. I have the budget to rent a second 7D body, and a third lens... hence my question. I will be able to roam the sidelines freely, and I use the shorter focal range to capture huddles, player and coach emotions on the sidelines, team photos and ceremonial moments. Or if a play lands in my lap. I'm anticipating that, on the sidelines, the available light will be less predictable than on the field. I'm confident in the 70-200 for the on-field play, but not so much with the 24-105 f/4. I can keep a flash on the second body. Would renting the 24-70 f/2.8 ii be a large improvement or should I consider adding a 35 f/1.4 or 50mm f/1.2 prime as a low-light back up for the evening? There's a photo of the field in this article: http://cityroom.blogs.nytimes.com/2011/11/15/on-the-soccer-field-a-roster-full-of-refugees/?_php=true&_type=blogs&_r=0 Thanks!