Hello fellow Photographers, I've been in the photography game for a while now, but I have recently decided to step into the off camera flash scheme. I'm having a issue trying to figure out how to control the power on the canon 580 ex II flash while its off camera. Let me give you a quick run down on my equipment so you get a better understanding of what Im trying to achieve. Camera: Canon 7D Triggers: Pocket Wizards III Light Meter: Sekonic Flash: Canon 580 EX II OK, so here is what Im trying to do. One PW goes on the camera, the other sync'd on the flash. Essentially, I will set the camera to AV mode and figure out the ambient light the camera is reading. Lets say F4 @ 1/60th. Once this is figured out, I will know what to match my flash power to by using the light meter to pair the reading from the camera with the off camera flash. From here, I can adjust the shutter on the camera to achieve the look I want (darker background, etc). I know this stuff pretty well... The problem I'm having is when the 580 EX II is on the light stand, how can I adjust the power to where I want it? Do I simply put it on Manual mode, and guess what power to shoot at based on what the light meter is reading? Any help is appreciated guys, thanks!