Question about Canon 28mm f/2.8 EF Autofocus Lens
I fell in love with this lens and was using it a ton and then one day all of a sudden it stopped autofocusing. Sometimes it does, but only about 10% of the time. I had it in the rain but it didn't get super wet at all - not any more than my cameras have gotten wet in the rain before. It has been knocked before but it worked after that. I am so frustrated. :( What should I do? I have tried cleaning the contact points between the lens and the body and it didn't fix it.
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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
Make sure the AF/MF mode button on the lens is set to AF.
What focusing mode do you have selected in the camera? Single Shot, AI focus or AI Servo?
If Custom Function "C.Fn IV -1 Shutter button/AF-ON button" is set to option 2 or 3, the AF will start when you press the AF-ON button.
I hope this help you!
Posted on Jan 19, 2009
Since the problem is limited to this lens, I highly doubt that you would have to replace the cameras AF sensors.
Since you only have the problem with this lens, I am afraid that you will have to get the lens repaired. Is the lens also 3 years old? Did you get it with MACK extended warranty?
Sometimes, Canon do these kinds of repairs for free, if they discover that there was some manufacturing error that caused it to fail. So be sure that you get it to a certified canon workshop.
I hope this helps,
Posted on Jan 20, 2009
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: Cannot auto focus
Canon 28-135mm f/3.5-5.6 EF IS USM AF - SEEMS TO HAVE LOST ITS ABILITY TO FOCUS - DOES OKAY MANUALLY, BUT AUTO HAS LOST IT'S SPARK - NO MORE ONE HANDED SHOTS! DOES NOT SEEK A FOCAL POINT BY GOING TO AND FRO - DOES IT NEED CLEAINING, CALIBRATION, OR WHAT?
Posted on Jul 28, 2010
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