Canon USM 100-300 no longer focuses

Discussion in 'Canon' started by kiltiesdrumguy, Mar 2, 2004.

  1. It just stopped auto focusing. I can focus it manually and the
    apeture works, kind of reminds me of 1985 but I digress..Does anyone
    know of anything I can do short of sending it in? I did clean the
    contacts..

    Thanks
     
    kiltiesdrumguy, Mar 2, 2004
    #1
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  2. kiltiesdrumguy

    DM Guest

    See if it works on a different body. Do any of your other lenses have
    the same problem?
     
    DM, Mar 3, 2004
    #2
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  3. Yes, my 28-105 USM works fine and this lens doesn't autofocus on any
    body. It really isn't a big deal, I can focus it myself but if there
    was a quick fix anyone knew I would appreciate that.

    Thanks for the reply
     
    kiltiesdrumguy, Mar 3, 2004
    #3
  4. kiltiesdrumguy

    DM Guest

    In that case it looks like either some electrical contacts or wiring is
    faulty inside the lens, or the AF mechanism itself needs a repair. You'll
    definitely need to send it back for repairs.
     
    DM, Mar 4, 2004
    #4
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