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

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Lens auto focus sometimes does not work

I dont know hao to clean the contacts?

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  • Iron_Biker May 30, 2008

    i don't know how to clean it, i already tried pencil eraser.

  • Iron_Biker Jun 01, 2008

    I cleaned the contacts as recommended but the problem continues, this is the only lens I have with this problem and already try it with my new Canon 40D and it behaves the same way. Should I send it to Canon?

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Pencil erasers can remove and clean, but rubber is an insulator. Don't go crazy with this, but just a bit of 91% rubbing alcohol on the end of a Q-tip applied gently to contacts will remove oxidation and improve electrical contact. Do the lenses first (I assume more than one). If this still doesn't help, then the problem is with the camera. This is a service issue (repairman). If you only have one lens, try it on another camera. Since you say "sometimes" I think cleaning will do the trick.

Posted on May 30, 2008

  • fred hutchings Jun 04, 2008

    If you can, take the camera and lens to a camera store and ask to put another lens on the body. If the problem persists, then the camera is at fault. If you can put the lens on another camera body, then the lens. Based on your response, I would have to bet on the lens having a problem. Cannot imagine a dealer not helping you out here. You spent a lot of money, and if there is a problem, let the dealer return the lens for you. The extra charge can't be that much, and checking it out through a sales outlet sounds safe.

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Make sure the auto-manual focus switch on your camera is set to auto (A) and also make sure the auto manual focus selector on the lens is in auto (A) as well. If your lens contacts are dirty then this will affect the function of the lens as well. Clean those with either a lint free type cloth and alcohol or methylated spirits.

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This to me is a connection problem and may only require moving the AF-MF button back and forth a few times or removing the lens and cleaning the contacts between the lens and camera body.
Generally the "L" series lenses are pretty resilient in construction of offer the user few problems.
The lens contacts can be cleaned with a soft red rubber pencil eraser where you lightly polish the contact area of the gold contacts. Clean away any rubber dust with a lens cloth not a tissue, be extra careful not to get dust into the camera body cavity. reassemble the lens and try the camera lens operation
Diagram
tri3mast_204.jpg
This should clean up the problem

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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.

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#1880e583.jpg #2 d5f637d.jpg

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