Okay, this is a question for those who have used Canon gear pretty extensively. Hope someone on here might know the answer. I've been fiddling with using my various pieces of gear to command an off-camera flash unit in ETTL. The important thing here is that I can control the EV comp on the off-camera flash by adjusting controls on-camera (if I put the camera outside a window, I bloody well don't want to have to run outside just to dial the flash up or down, just to run back in, take another shot, and realize I should've dialed in less or more; I'm sure you know what I'm talking about). I've messed with using one of my 580's to command another 580, and quickly figured out that if I left the commander 580 on-camera so that it didn't fire, and set the EV comp there, it would also be applied to the off-camera flash. So far so good, that gives me a wonderful exposure latitude of EV -3 to +3 stops. But when using the ST-E2, there's no ETTL EV comp on the commander unit itself. A little more futzing and I figured out that I could use the flash exposure comp in my 450D's menu to set the EV comp between -2 and +2 stops. Thing is, that's two stops at the extreme ends that I lose if I need to use the ST-E2 transmitter. When I'm backpacking and running around, I'd much rather use that baby commander unit to trigger off-camera flash over carrying my second 580. So, here's the question: Does anyone know how to finagle another stop of flash exposure comp in ETTL while using the ST-E2 and setting the comp from the camera's menus? Or do I need to sacrifice one of my other flashes to get that extra bit of control?