Question about Canon Cameras
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.
Posted on Sep 02, 2010
Testimonial: "I did as your recommendation but the problem still persist intermittently. I guess I need to take it to the service centre. Thanks"
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Posted on Jan 02, 2017
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