Question about Canon EF-S 17-85MM F/4-5.6 IS USM Lens

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Error 99 and jerky fixation of focus between 17 and approxinately 30 mm works perfectly at zoom lengths beyond this with normal rapid fix of focus and records image normally. the error and failure to record image occurs whether lens on auto or mnual focus

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'Error 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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Focus hutning with Canon EF-S 17-85mm f/4-5.6 Image Stabilized


I had this problem too, then my camera started getting Error 99 (there is some problem) and not working.
If you look at this website and follow the steps under Update 2
http://www.richardsnotes.org/archives/2005/04/29/50mm-lens-contact-points/
I think you will fix your problem. The connections between lens and camera probably have a little dust in them, use a soft rubber eraser to clean them. Make sure no dust or pieces fall into the camera or lens when cleaning!

Jul 28, 2009 | Canon EF-S 17-85MM F/4-5.6 IS USM Lens

1 Answer

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Yes, this is normal. Some zoom-lenses adjust the focus when zooming, to always keep the subject in focus. Those tends to be the more expensive lenses.
So you don't have to worry, nothing is wrong with your lens.
/Chris

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