working on some studio lighting and want to have my two Canon Speedlite 580 EX II's to fire simulatneously using Canon's built in wireless communications (i.e. The Master to trigger the Slave, but also to provide some fill flash as well). I am pretty sure I had this working at some point, but now I have noticed that the Master Flash does fire when the shutter is pressed, but the Slave flash fires a good 1 or 2 seconds after the Master has fired (and after the shutter has closed and photo has already been taken). I have been pouring over documentation and videos wondering what I could have missed, surely it is a setting somewhere that I have accidentally set?
Set to ETTL Channel 1 On Ratio A:B is 1:1
SLAVE 580EXII Channel 1 On Group B
Notes: I have tried a couple of things: 1) connecting the Master and Slave with the Mini Phone Jack 2) Making sure the Master is directly in front of the Slave's panel so there could be no interference with the signal. 3) I have tried it with the Master ON and the Master OFF 4) I have tried it with the Master both in the Camera's Hotshoe and on a Hotshoe adapter. 5) Even tried replacing all the batteries in both Flashes. 6) have tried both flashes in Group A.
I will try to attach Pics of the LCD panels. I must be missing something obvious... please forgive me if I did. Thank you in advance!
P.S. I have the Master set for a -1 Flash Exposure Compensation but I have tried removing that as well.