Hi all. Could do with some advice. I've just bought the Elinchrom D-lite RX 400 studio kit and I seem to be having a slight issue with sync speed. I'm running a Canon 5D mkiii which I put on a shutter speed if 200. I pop the lights into high speed sync but I still seem to get a slight grey band at the bottom of my images. If I drop the ss to 160 then it doesn't seem to be an issue. It may just be light fall off but if I turn the camera to portrait orientation and take a shot it happens on the right side of the image. Is it a sync speed issue? Can you advise me please.