Any pointers? I'll have my tripod, 40D, Sigma 10-20, Canon 28-135, and flash. First time I've shot one of these. I'll set the white balance before the cars come, and I'm trying to get to each stage with enough time to get a decent shooting position. I may go to the night session on friday, but I dunno about using a flash when they are racing. Seems like an asshole move.