tried some different lighting stuff last night, here are the results (just snaps): for strobists: first shot with a 580ex into a 30" white umbrella, about 4 feet above him and a little in front of him. the 580ex triggered a 430ex on his left side, shot through a 46" transluscent white umbrella. second shot was a 580ex shot into a 30" white umbrella, a little in front of and above me. both shot with the 5d+24-70L combo. thanks for taking a peek!