Tokina 11-16 + 7D = Autofocus Fail?

Started Oct 15, 2009 | Discussions thread
lipmonger New Member • Posts: 21
Re: Tokina 11-16 + 7D = Autofocus Fail?

I recently purchased a refurbished Canon 7D (direct from Canon) and I am experiencing this same issue with my own Tokina 11-16 lens. The lens worked flawlessly on my 40D, but has very erratic and inconsistent focus performance on my 7D. I recently spoke with Glenn (the tech who answered the phone) at THK Photo, and he said my lens should pair perfectly with the 7D. Since my 11-16 was recently in for a cleaning and came back meeting full specs, I have no reason to think the lens is the issue.

Regarding my 7D, it has already been back to Canon once for warranty service due to poor AF performance with me existing lenses. The body came back with "electrical adjustments performed on the AF assembly" by Canon service. Performance is slightly improved with Canon brand lenses, but focus is still relatively inconsistent (random images front/back focus at items than were nowhere near the AF spot-point that was selected). I'd say I 4-in-10 are now keepers, compared to the 1-in-10 performance I got prior to the initial service. Still, I think focus performance should be better.

I just got approval from Canon to send my 7D in for another go 'round with their service team, but I'm wondering if anyone has any more info to add to this Tokina issue? I found this thread after some Google searching, and while it's somewhat comforting to know that others are having this issue, it's frustrating that no universal fix has been found.

In my experience with the 11-16 and 7D pairing, the center-point is the most reliable, but then only at 16mm. At 11mm, none of the points are reliable, but I can get by at 16 with manual center-point selection. I've tried a variety of MF adjustments, and they seem to work for a photo or two, until the focus goes out the window again.

sigh

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