I just got in a YN-568 ETTL II flash. This is my first experience with an ETTL flash - used manual to this point.
I tried using it to bounce flash and it severely underexposes. My understanding of ETTL II is that exposure is set via a pre-flash and should account for bounce, or any other modifier, when setting power level.
Searching the net showed a number of people supporting my inderstanding of how it supposedly works, but also a number of people who express the same issue I have, even with 580EX II.
So not sure what to think at this point. Should ETTL II bounce flash properly expose or should I need to dial in +3 (or so, which makes the exposure close to right) on the flash first to make it work? If the latter, ETTL seems rather pointless to me except for direct flash, which seems to work, but has a pitiful asthetic.