Auto Focus

Testing the R6’s eye-tracking AF with the EF400mm f/5.6L in the bustling chaos of Shibuya sounds like a fun challenge! It’s great to hear the lens pairs so well with the R6, maintaining its reputation for quick and accurate focusing even on a modern body. The sharpness and speed you described make it clear why this lens is still a favorite for many, despite being discontinued. Sounds like a big step up from the EF300mm f/4L for tracking action. A shame it’s no longer in production—though, in the right hands, it still delivers magic.