Question about Canon EF 70-200mm f/2.8L IS USM Autofocus Lens
Posted by Anonymous on
If it focuses OK in manual mode then there is a possibility that you have a damaged ribbon cable in the lens.
Posted on Aug 31, 2016
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Posted on Jan 02, 2017
First make sure contacts on lens are clean ( see enclosed pic #2 ) . If this does not solve the problem the ultrasonic motor may be faulty pic #1.( sometimes switching on but sometimes not , will have to be replaced , unless there is a bad connection between the motor and lens pc board )
Posted on Nov 26, 2007
I have had to replace the focusing servo motor is these before. The problem of seeking without locking in may mean the same for your lens. Do check for a dirty filter on the front and look to see if the rear optic is dirty or cloudy first. I'm assuming other lenses work fine on your camera.
Posted on Jan 05, 2008
Unfortunately, unless you suspect dirt in the lens (been taking pictures on the beach maybe? ;), this sounds like autofocus motor failure.
Even if you manage to source the replacement motor, swapping it is a really fiddly operation.
I would suggest selling the lens for spares on ebay and getting a new one.
They are fairly cheap these days. I recommend getting the IS version - it's much better than the original, although build quality is similar.
Posted on Nov 09, 2009
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
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