Originally Posted by Nate4641
7D has master control of slave flashes through the built in flash. Its still only optical/IR and line of sight with short range, but you dont have to have a dedicated master controller or extra flash to do so.
Ahh, thanks. I didn't know that, since I haven't used a 7D before. That being said, it's nothing that a simple (and cheap) Cybersync transmitter and receiver can't fix.