I'd like to be able to use a flash at a higher shutter speed than 1/60th with my 645E. I've been looking at the leaf shutter lenses, and have two questions. Does the sync cable connect to the lens or the body? Obviously its not syncing to a curtain, but if I were to drag the shutter to lets say 1 second, when in that 1 second would the flash fire, if I had it on reduced power? Thanks for reading!