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

    kiltiesdrumguy, Mar 2, 2004
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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
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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
  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
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