Question about Canon EF-S 17-85MM F/4-5.6 IS USM Lens

1 Answer

Lens auto focus sometimes does not work.

Not sure why this lens sometimes does not autofocus. I try to focus on my subject, the lens focus move left and right and will not focus on my subject. I have no problems with my other lens. In order to solve this problem, I have turn to manual focus. Just got my len over a year ago.
I'm afraid I have to take this to canon shop, hopefully there is a solution. changing the battery on my camera does not help either. Thank you.

Posted by vcanon on

  • 2 more comments 
  • vcanon Nov 27, 2007

    Cleaned contacts and have been shooting for the last 1hrs, so far so good, no problem. Thank you very much, if it happen again, I will take it in.

  • Anonymous May 30, 2008

    i have the same problem with my lens but how i clean the contacts?

  • fusiond Sep 05, 2008

    When i focus a far subject, my lens does not focus. Only does with a close objects.

  • Anonymous Mar 31, 2014

    My canon 1.4 50 mm lens for lens for my T3I camera stopped focusing in both manual and auto focus. the dial turns but the focus doesn't grab.

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1 Answer

zdenek vajdak

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First make sure contacts on lens are clean ( see enclosed pic #2 ) . If this does not solve the problem the ultrasonic motor may be faulty pic #1.( sometimes switching on but sometimes not , will have to be replaced , unless there is a bad connection between the motor and lens pc board )
#1lens auto focus sometimes does not work. - 880e583.jpg #2

Posted on Nov 26, 2007

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