Originally Posted by edfrometown
I'm not sure what the rumor is, but jut to be clear, ETTL is not useable via PC Sync. As I understand it, PC cords only carry a simple "fire" signal, and don't provide for two-way communication between the flash and camera, which would be required for more advanced operation.
Having just purchased a 580 EXII a few weeks ago, I was disappointed though to discover that it won't fire via PC Sync when set to both "Manual" and "Master" mode. I intended to have a simple studio setup with the 580 EXII connected to my 50D with the sync cord, which would then fire my 430 EX using the infrared signal. I checked on the Strobist discussion forum on Flicr, and was told that the 580 EXII will fire in Master and Manual mode if I use a hot shoe adapter instead. I have yet to confirm, as I am waiting for additional equipment to arrive.
Just to be clear, I have been using the 580 EXII with the PC Sync just fine in Manual mode, without setting it as a master to fire my other flash. This works like a charm, but if that was all I was going to use my 580 for, I would have bought a much less expensive flash.
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