One, does it work with the Canon CP-E4 Compact Battery Pack, or is there a new pack we have to buy?
And Two, does anyone know if it can transmit the original IR optical signal while simutanously emiting the new RF signal??
Lets say I buy 2 600ex's, and I want to use them with an existing 580exII. I put one of the 600's in the hotshoe as a master, I place the 580exII as a slave that is well within range to fire via the IR signal, can I then place the second 600 somewhere out of sight if I need be, and have it triggered with the RF??
I hope I didn't sound too confusing and someone can help me out. I was looking to add another flash, then one of my 580exII's broke and now I am looking to add 2 new flashes. Thanks for all your help in advance, appreciated as always.