I have the R6 set up so that the back button focus turns on normal Autofocus. The * button turns on the animal / people / eye detection. When shooting this image I initially used the normal autofocus to focus the head. Then, just to see if it would do it, I hit the eye detection autofocus and was shocked that even though it didn't have a clear view of the head it still identified the eye and locked on. Even more impressive given all the foreground and background clutter. This is why I'm so keen on them making the R7.