I'm helping friend who has asked me to do production stills for a short movie he is making. Aside from the standard set shots and press kit stuff, we are shooting in front of a green screen this weekend. Since I've never shot in front of a green screen, I have no idea what I'm getting myself into. The screen is at a studio, and while I'm assuming there will be some type of lighting available at the studio, I'm going to bring along my CLS equipped Nikon with a couple of remote flashes and diffusion umbrellas........just to make sure we have enough light. Have any of you done any green screen stills?? If so, is there anything in particular I need to watch out for? Thanks!