The problem came all of a sudden. No shocks or dirt - it just stuck without prior warning. Autofocus works just fine. No fault indications on camera screen.
Sand or some kind of dabre in in focus gears, Needs to be takin apart and cleaned, This is in the middle of the lens,
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?
SOURCE: Autofocus Does Not Work
there is couple of possibilities like wise when you zoom lens manualy and can you heard the hard noise then could be AF unit itself faulty. AF unit gear is gone.
could be AF shaft broken thats why not focusing
for that please bring to canon service center
SOURCE: Auto Focus not working for Canon EFS 18-55mm lens
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.
SOURCE: when the autofocus mode is switched on the
Unless you suspect dirt in the lens, this sounds like autofocus motor failure or contact
film inside the lens has been broken. This film bends while zooming a
lens and I think It simply wasn't made reliable enough.
If it's still not working, you could try wiggling the lens very slightly
while it's mounted just to see if the contacts aren't seating right,
and cleaning the contacts on the lens and camera. Otherwise it would be
investigating your guarantee.
Call at Canon Service Center and they said that may need to change the whole
AUTOFOCUS MECHANISM of my lens! They said, this kinda problem IS
there with the kit lenses.
Few clues, but hope helps.
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