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Manual Focussing failure with Canon EF 100-400mm SLR zoom lens

I have a Canon SLR lens which I use with an EOS 20D body. I have had the lens for a year and foud the other day that the manual focus funcion no longer works, the focussing ring just turns around on the lens barrel and makes no difference to the focus at all. The auto-focus function thankfully still operates, so I can still use the lens, but there are situations where manual focus is necessary. Is there anything I can do to restore the manual focus or is this a job for the technicians?

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  • drsPIX Nov 25, 2008

    My lens will not focus on manual nor on automatic. It is firmly fixed at about 5 feet. No matter what zoom is selected. Won't budge.



  • Anonymous Apr 12, 2009

    I dropped my camera and the a part inside the lense is moving around and it won't let me adjust the focus.

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I doubt if there is anything you can do yourself. The manual focus may have debris under the ring or is in need of parts. I would leave this one to a tech.

Posted on Jan 23, 2008

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