450D & 580EX II off 12V battery
Thanks for the info.
What is the external DC voltage limit of the Canon 580EX II SpeedLite? It has four internal batteries (6V). I've seen external battery packs with six batteries (9V?). I've also seen DC battery packs stating "high voltage".
Would I be able to leave out the four internal batteries and supply the 580EX II with 12V DC through its external power socket. I can't seem to find a upper voltage spec for this input.
Thanks in advance.