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

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Canon 28-135mm IS lens makes clicking noises

It seems if my Canon 50D is on for awhile, the lens will begin adjusting the f/stop. I think is what it's doing since the f/stop will flash between what I have it set to and 0.0. At one point I got an error message saying the lens contacts were dirty.  Is this a problem with the lens or the camera? Thanks

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  • bcoliva May 18, 2009

    I have the same is almost 1 month old and I've tried cleaning the contacts multiple times. Tried different camera settings, etc. I doubt seriously if it's the mirrors on the camera as the error message states to clean the contacts. My guess is the lens itself...did you have any luck?

  • katieliz753 May 19, 2009

    i'm frustrated too. my camera/lens goes ballistic making clicking sounds and i am unable focus or take any photos. now, my 50mm 1.4 lens will quit take photos and stop autofocusing.


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Check out the mirrors on the camera, This is a pretty popular problem with the canon cameras. The lens gets dirty in the camera and it sends a error code

Posted on Feb 08, 2009

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