I shoot weddings occasionally, and I wrestle with this every time. I have 2 bodies that I'll be using for this next wedding, a 1DX (full frame) and a 1D4 (1.3 crop). I have a pretty nice assortment of lenses to choose from...some better in low light...others that focus faster on a moving target. This wedding will be in a small, relatively dark chapel, and I don't know yet if flash photography will be allowed. If I assume it IS allowed, I was thinking about maybe putting the 24-70 f2.8 II on the 1D4 with a 580EX flash and the 85L on the 1DX with no flash...or maybe the 70-200 f2.8 II on the 1DX because it focuses faster. Once the ceremony starts, it's easier because I have stationary subjects to shoot, and I can decide based on whether I can use flash or not and where I need to stand. I'm curious what others have found to be the best combo for those coming down the aisle shots, with or without a flash. Thanks.