Question about Canon EF-S 17-85MM F/4-5.6 IS USM Lens
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Posted on Jan 02, 2017
SOURCE: Error 99
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
That's a really odd fault and to be so specific in focal ranges is a further oddity which makes me wonder if it's the mount having a slight bit of movement (slop) in it.
I have that very lens and use it regularly about a year ago I sent it to Canon for some minor service when it came back it had a different "feel" the lens was tighter in operation.
Would it be possible you need to clean the gold contacts on both the lens and body (I know you said it wasn't the contacts) with a red rubber eraser making sure not to get the rubber dust into the sensor area. Then watch the lens as your shift through your focal lengths to actually see if the lens is moving slightly between the lens and body. Make sure the lock is in tight with a distinct click, if all this fails then I'm sure a trip to Canon is in order, it's a great lens and worth the repair.
Posted on Jan 06, 2011
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