I just now this very minute opened my birthday present from my wife. Canon 580 EX II!!! Woohoo!!! What a sweet strobe!! Been "playing" with it for about an hour. It makes my 420EX look like a toy! My question is can I use my 420EX speedlite as a slave and my (brand spankin' new) 580EXII speedlite as a master? I couldn't really get it to work in my brief attempts. I guess if it's not possible I'll just have to go out and get one or two more 580s. Oh well.

