Hello All! Nothing I've read so far suggests that the Canon Speedlite 580EX II has built in support for wireless RF triggering. Can someone verify this for me? I shoot Canon and I'm kind of looking for something that does.... it's not a deal breaker, but it would be nice if I didn't also have to get an RF receiver. I'm not wild about IR and optical slave triggering. I want to be able to fire a flash that's behind something and/or possibly out of range of optical/IR. I don't have much experience with multi-flash setups, so advice is welcome as well. Thanks!!