50mm f1.4 Auto focus cannot find focus [ring already replaced], any ideas?

Started Jan 2, 2013 | Questions thread
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BobHunter
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50mm f1.4 Auto focus cannot find focus [ring already replaced], any ideas?
Jan 2, 2013

After replacing my focus ring (yes the typical thing that breaks), I have noticed that the lens can only find focus about 50% of the time in good lighting. I can manually focus just fine and the autofocus appears to have no issue moving the glass, it just cannot lock on focus. And we are not talking about a little bit out of focus or the wrong element is focused, I mean the entire image is out of focus.

No other lenses are having this issue. Issue is present on my T2i and 5DMII.

Here is a video of issue: http://www.youtube.com/watch?v=U_b1kiiIfdI
Any ideas on what could be wrong?
Both pictures are in focus according the camera/lens.

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Canon EOS 550D (EOS Rebel T2i / EOS Kiss X4) Canon EOS 5D
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