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Thread: AF Malfunction EFS 17-85 IS

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    Ausphotography Veteran rwg717's Avatar
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    AF Malfunction EFS 17-85 IS

    Before I commit $$$$ to professional advice, perhaps someone might have a quick answer to this problem. Have an EFS 17-85mm IS lens which has a malfunctioning AF system, the symptoms are identical to using the AF on a lens which is in perfect order when trying to focus on a plain white wall or when it is too dark in a room for the lens to get a correct read on the focus point.
    I bought the lens at a decent discount knowing that the problem existed, thought a change of camera body might fix it but no dice there. Tried cleaning the contacts and same result, no joy. Then tried another 17-85 on the same camera body and perfect focus!
    The focus system continually works its but off trying to get a correct read until you zoom right out and then "half-press" the shutter button, AF then works fine for a couple of shots and then reverts itself to focus in and out, in out.
    Probably a busted chip in the lens, me thinks.
    Richard
    I've been wrong before!! Happy to have constructive criticism though.Gear used Canon 50D, 7D & 5DMkII plus expensive things hanging off their fronts and of course a "nifty fifty".

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    Sorry can't help you with your lens as I am having similar problems with my 17-85mm wondering myself weather to get mine fixed. Good luck with it
    Cheers Debra
    Canon 50D l G11 l Sigma 17-70 l Sigma 70-200 l Sigma 10-20 l Canon 50mm 1.8 ll l
    Canon 60mm macro l Canon 100mm Macro lS l Canon 17- 85 l Canon 24-105mm l Speedlight 580 EX ll + other bits n pieces

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    Quote Originally Posted by mrsgrumblebum View Post
    Sorry can't help you with your lens as I am having similar problems with my 17-85mm wondering myself weather to get mine fixed. Good luck with it
    Thanks for the reply, I have heard of another instance of this problem with the EFS 17-85, perhaps a manufacturing fault with some of them????
    Richard

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    sounds like the same problem I had with the 50 1.4

    I read on another forum that it was a broken USM, so I didn't bother getting it fixed.
    Criticism & Suggestions welcome
    A pretty standard Canon setup covering the 17-200 range.
    Sigma 50 1.4
    Various film cameras

    My Flickr stream: http://www.flickr.com/photos/arubaato/

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    Member beckett5361's Avatar
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    Hi I had the same thing in my 17 85mm canon lens they assured me it was not common but I suspect it may be more common than they let on. I sent it to Canon and they replaced the Diaphram and it cost $180.00 including return postage. So the lens was fixed recalibrated, serviced and posted back for $180 no too bad. It functions perfectly again. Error 99 vvvverrrr....

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    Member schc's Avatar
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    It is a common problem, A search of ebay for the lens will confirm that. I too have the same issue.

    I'm forking out for some L glass instead
    Canon 40D
    Sigma 10-20mm 3.5 | Canon 50mm 1.8 II | Sigma 50-150mm 2.8 | 580EX II | Canon BG-E2N Battery Grip

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    Loves The Wildlife. Mary Anne's Avatar
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    Had the same problem also got it fixed when it was 15mts old and within a year the same thing happened.
    I did not get it fixed the second time I bought better glass instead.

    I shoot with Canon And Olympus Cameras



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    Quote Originally Posted by Mary Anne View Post
    Had the same problem also got it fixed when it was 15mts old and within a year the same thing happened.
    I did not get it fixed the second time I bought better glass instead.
    Thanks for that, sounds like it might be a "tip job"....better look around for something better myself
    Richard

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