Just received my YN=565EXf;ash. The whole reason I purchased this unit was to use E-ttl with my softbox. I have three different brand ettl cables and none will work consistently with the 565, yet when I mount it to the camera it passes exposure info perfectly.
when I look at auctions for the ettl cords, even the Yongnou brand, it never says it is compatible with the 565, only mentioning the various Canon series lights.
I just paid 61 dollars for a 24 foot straight ettl cable and it will not work, most of the time the flash won't go off, or when it does it is simply full power and too bright, yet the flash is reporting the proper zoom on thelens and when I make zoom changes to the lens the flash reflects the changes properly.
My camera sees the flash in ettl mode andgives me the option to change settings, when I change fec on the camera the flash chages power accordingly, but then won'tfire or will fire with too much light. Put it directly on the 5D2 and it fires properly and the 5D2 has noproblemswith it.
Surely all three of my eltl cords are not bad.