Question about Canon EF 24-70mm f/2.8L USM Lens
It won't focus properly
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Posted on Jan 02, 2017
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
SOURCE: Auto focus not working?
1st u reset the factory setting and then u see the lense is correctly fitted or not and the autofocus option is working or the manual focusing is there or not
Posted on Dec 14, 2009
If your AF motor is hunting then the lens probably needs to be looked at. I wouldn't recommend this as something to do at home so you will need to either find a repair shop if it is out of warranty or return it to Canon if it is in warranty.
Posted on Jan 17, 2010
This usually happens when the contacts between the lens and the camera are dirty. Try taking the lens off and cleaning carefully the metal contacts on the camera and the lens. If that does not solve the problem, you can get a warranty repair or replacement since that camera should still be under the original 12 month warranty.
Posted on Jul 21, 2010
I see this same problem occuring all over the internet on Canon lenses. Autofocus not working any longer. For some stupid reason the lense will lock up and quit autofocus while other lenses will work fine. A light pull on the lense focus ring away from the camera body will give a noticable pop or click which unlocks the jammed lense. Try it if you are having troubles with your autofocus. This is a very common problem and worth giving it a try.
Posted on Dec 20, 2010
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