Question about Canon EF-S 17-85MM F/4-5.6 IS USM Lens
I experienced the same problem ( Err 99) on similar set-up after taking around 9000 shots. I have read solutions from upgrading firmware to 2.0.3 and extensively cleaning the gold contacts on the camera and the lens with alcohol. Since my firmware is already ok, then I think the cleaning did the thing.. my camera does not randomly give the error anymore!
Posted on Dec 01, 2008
Assuming that other lenses function normally on the camera, the "Err 99" can be caused by a failure of the aperture component in the lens. Error 99 is a generic error, so unfortunately it does not indicate exactly what is wrong. There are other factors that can cause the failure, but there is a good chance that the aperture is not functioning correctly. You can try cleaning the electrical contacts on the lens, if this does not work you may need to get the lens serviced. Check with Canon, or check the web for other repair service providers. David Millier Advance Camera Repair
Posted on Mar 06, 2007
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