I’ve been comparing the Yongnuo YN568EX II to the Canon 580EX II in a few somewhat unscientific tests. In this case (above) I used the Yongnuo YN-622C Wireless flash trigger to fire both the 580EX II and YN568EX II. Both flash heads have the same guide number (58) and are set up identically. After taking a few test shots, it seemed to me like the 580EX II is slightly brighter than the YN568EX II. The difference isn’t enough to be a problem, but I did find that the YN568EX II needed +1/3 compensation to properly match the 580EX II.
This adjustment was made after I took a few shots of both units firing and looked over the results. Take a look at the shot above and let me know what you think. I don’t do a lot of flash testing and I usually set up compensation based on what looks good to my eye. If you have any other methods you would like me to use in order to compare these two units let me know.
So far the Yongnuo YN568EX II has done a great job. Recycle times are only slightly slower than the 580EX II, flash output is fairly similar, and HSS seems to respond well on both the 5d mark III and 6d body. It really pairs well with the Canon bodies I’ve tested and at $175 the Yongnuo YN568EX II seems to offer a lot of bang for the buck. I know it’s missing a few of the things people love about the 580EX II like the power adapter and slide to lock system, but for the price I think many would be more than happy to change out batteries and put up with a twist down latch. I’ll continue to mess around with it and keep you posted on my impressions as I spend more time with the Yongnuo YN568EX II.