I'm sure this has been addressed, but I haven't figured out a search string that brings it up for me.
I want to be able to control a 580 on camera in ETTL but I also want to fire a remote Sunpak flash on manual via Cybersyncs. The Cybersync transmitter wants to sit in a hot shoe. I assume I can run a short PC chord to a secondary hot shoe with the Cybersync in it while the 580 is in the real hot shoe? Will that screw up the 580's ETTL? What exactly do I want to look for to hold the Cybersync transimtter and are there any specific specs I need to be mindful of?