Question about Canon EF-S 17-85MM F/4-5.6 IS USM Lens
99' indicates some problem with the AF contacts. This is a common error
in Canon lenses. It could indicate a very simple problem like dirty
contacts or a much serious one like the breakage of USM cable.
As a first step, you can try cleaning the lens and body contacts (the metal contacts between the lens and body) using a pencil eraser. Be careful to hold the body facing down so that no dust falls inside. After cleaning both the lens and the body contacts, re-attach the lens and try shooting. If the AF does not work still, you need to take the lens to an authorized service center.
For the jerky focusing ring, you need to get the lens serviced by an authorized service center.
Posted on Sep 02, 2010
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Posted on Jan 02, 2017
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