Hi all, I have a question that I'm really hoping someone here can answer for me regarding Pocket Wizards. I have a Canon 430 ex and I'm awaiting the arrival of a Canon 580 ex II. I also have 2 Pocket Wizards...one to place on my camera's hot shoe and the other will go on my 580. Do I need to buy a third Pocket Wizard or does the 580 communicate with the 430 without the need of a PW? Can somebody help me out with this silly question? Thanks, Jose S.