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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Every time that I'm using my canon 17-85 lense on my canon eos-20D it
gives me error 99. Could you please help me solve this problem
when i shoot with the lens at 17 i dont have a problem. when i zoom to any other number i get a error 99 ,80% of the time
i have the same problem when using a 17 - 85 EF lens with my.20D.
The most annoying thing is that it has been fine for a couple of years and i never had any problems until i took it on holiday with me...so i missed out some potentially good shots.
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