Okay, I have some potentially stupid questions. First, is rear curtain sync possible if the camera (Rebel XT) has this custom function? Or is it only possible if the flash (Vivitar 285HV) also has it? That is my situation, and so far I don't think it's possible to do rear curtain sync with vivitar 285HV on my Rebel XT. I read the manual, but it's not telling much. So here's the follow up questions: Is rear curtain sync only possible with Canon flashes on my rebel xt? Also is it possible with strobes like dyna-lite, and calumet's travelite?