Question about Canon 24-85mm f/3.5-4.5 EF USM Lens

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Dust inside the canon ef 24 85mm lens

How to unassemble canon ef 24 85mm lens to clean all dust ?

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CAUTION! DO NOT EVEN THINK ABOUT DISASSEMBLING YOUR LENS. In 1964, I made the mistake of doing the same thing for a single focal-length lens for my Nikon F. This lens did not even approach the mechanical complexity of a modern zoom lens. Lenses are put together like jigsaw puzzles. I removed one screw and found to go further, I needed to do another. In fifteen minutes, the lens was in 50 pieces on the table. It cost over $175 to have a camera repair man reassemble it. This was a a time when the top of the line Nikon sold for $300 vs. $5000 today. Usually dust between elements does not affect performance, but if it is degrading your pictures, take the lens to a professional. This is not a job for an amateur.

Posted on Nov 28, 2008

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The image sensor in the camera needs cleaning. You can buy cleaning kits, but often you'll just make the problem worse until you gain experience. Many camera shops now offer professional sensor cleaning so you might decide that it's better to pay someone else to do it for you. If you join a local camera club there's also usually at least one sensor cleaning guru who can do it really well if you buy him or her a beer.

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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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Possible power problem make sure the camera has sufficient battery power and is functioning as it should (less the lens) if this is okay then the problem is between the lens and body gold contacts. It's a quick and easy repair you can do yourself. Shut the camera off remove the lens and put the body cap on the camera if you don't have a body cap place the camera on a clean lint free surface like a glass table or counter top. Use a new clean red pencil eraser to gently rub the gold contacts on the lens. Hold the lens as vertical as possible when you are doing this to minimize the rubber dust getting into the rear lens element. Clean the area of rubber dust with a puffer blower or lens cloth not a tissue. Set the lens down on the clean lint free surface and gently clean the gold contacts in the camera body keeping the camera lens mount down to minimize any rubber dust from getting into the sensor area. Clean the contacts with a lens cloth only do not use a blower/puffer, re-install the lens and it should come on. When installing the lens make sure it makes a solid click and locks securely in place.

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Have a canon 17-85mm USM lens. when taking photo using 17-35mm get err 01:faulty communication between lens and camera and to clean lens contacts, but works when using 40-85mm range. Cleaned contacts but...


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.

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How to dismantle the lens front element. My reason is to clean the dust inside. Thanks.


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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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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!

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Cleaning inside Canon 50mm /f1,8 II


Hi,

you can have a look here:
http://www.ejarm.com/photo/ef5018iidis/
and here:
http://nis-lab.is.s.u-tokyo.ac.jp/~ybando/rgb_filter/disassembly.pdf

HTH,

Jean-Marie.

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