Stuck Hood on Canon 400mm 5.6L

Discussion in 'Canon' started by Eric Miller, Apr 28, 2006.

  1. Eric Miller

    Eric Miller Guest

    Has anyon had this problem. The attached hood on my Canon EF 400mm 5.6L USM
    lens will not "release" when twisted and is extremely difficult to move. Any
    suggestions. One thought I had was to put it in the freezer to see if the
    temperature would allow it to release. I'll probably just do the boring
    thing and send it to Canon and let some "qualified" person fix it, but am
    willing to try any suggestion that doesn't appear too risky.

    I used to think the attached hood was a good thing, now I'm wishing it had a
    detachable hood like the 70-200 f4 has.

    Eric Miller
    Eric Miller, Apr 28, 2006
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  2. Eric Miller

    Annika1980 Guest

    I've had similar problems with mine. And lately it's even developed a
    problem with the manual focusing ring. I can turn and turn and it will
    barely focus. Something is obviously loose inside. This doesn't
    happen when I use auto focus but with the 1.4x attached it's a real

    Having said all that, it's a wonder the lens works at all since I beat
    hell out of it.
    Annika1980, Apr 28, 2006
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  3. Eric Miller

    ... Guest

    Those lenses have a friction drive on the focus ring to prevent the USM
    drive from damage when you rotate the focus ring in opporsition to the
    motor. Maybe $80 to repair.

    ..., Apr 29, 2006
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