Question about Canon 28-135mm f/3.5-5.6 EF IS USM AF Lens

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Cannot auto focus

I like this lens and used to use it a lot but have had to stop using it because it cannot auto focus any more.
The lens simply drives back and forth hunting for a focus point. It sometimes stops hunting allowing me to take a picture but this is usually blurred.
If I switch it to Manual Focus and turn the focus ring by hand, the camera detects when the picture is in focus correctly.

I have tried cleaning the inner and outer lenses as well as the contacts on the camera bod and the lens itself.

I know it is a lens problem because if I use one of my other lenses, I get autofocus instantly.

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I have the same problem with my 28-135mm is usm lens, the lens move like crazy but in jumps, and never get in focus

did you find the solution?

thanks

Posted on Feb 11, 2014

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Canon 28-135mm f/3.5-5.6 EF IS USM AF - SEEMS TO HAVE LOST ITS ABILITY TO FOCUS - DOES OKAY MANUALLY, BUT AUTO HAS LOST IT'S SPARK - NO MORE ONE HANDED SHOTS! DOES NOT SEEK A FOCAL POINT BY GOING TO AND FRO - DOES IT NEED CLEAINING, CALIBRATION, OR WHAT?

Posted on Jul 28, 2010

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It sounds like the circuit board flex has gone bad, It folds back and forth when you zoom the lens, And needs to be replaced by a repair shop and readjusted. Tony

Posted on Jun 04, 2010

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