Rank: Wiz
Rating: 86%, 45 votes
I have never heard anyone mention a backfocus problem with this lens. In my experience, most of the backfocus issues that I have worked with to help people resolve have panned out as user error and/or a misunderstanding of the AF modes and performance of the camera. You sound like you know what's up, so that may not apply to you...you may have a real issue. The best thing for you to do before proceding to having is service is test the lens thoroughly on both bodies to see if this is a consistent, reproducable problem or just an anomaly.