I have been using these triggers for a little while with my Canon 5D MKIII with good success, but by no means learned them fully yet. I just sold my MKIII & got a 1DX 2 days ago. I tried out the triggers with my 580EX IIs, just a little testing to see if the flashes fired, and they do, but here's a problem I notice: when I go to External Speedlight Control>Flash Function Settings, it shows ETTL and it won't let me choose to adjust the Zoom & there's nothing there to adjust the power if I have Flash Group "ALL" chosen. If I choose A:B or A:B:C it shows me ratio choices (which I do NOT understand!) but no choices of just the power ( 1/1, 1/2, 1/4 etc) like before. Do you have any idea what I'm missing?
That was it! Thanks so very much!

