My 580EX II fires only in full power when connected to some of my Yongnuo YN622C II transponders.
I have four transponders and the 622C-TX transmitter as well. The 580 works fine, ETTL all good and exposing properly, on one of the four 622s, and when on the hotshoe of my 1100D, 400D, 700D and 7DII. But when on one of the other three 622s, the 580 will only fire full power (which generally results in a white-out over-exposure). When on these 622 the 580 is not getting info from the camera (e.g. Changing the zoom on the 622C-TX does nothing to the 580).
I have a 430EX II and it works fine, in ETTL, everything as expected, on all four of the 622 transponders. The transponders all send info to the 430 as well when they are on the hotshot of the camera.
It seems to me that there has to be something wrong with the 580. But WHAT? Given that it works fine when on a camera and works fine on ONE of the 622s but not the other three...? Help me Obi Wan Kenobi, you're my only hope...
