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New Contributor
Posts: 2
Registered: ‎04-07-2017

Canon EF-S 18-135 IS STM manual and auto focus not working

Went to shoot pictures yesterday at my son's baseball game and took only one lense, the EF-S 18-135 3.5-5.6 IS STM on a EOS 70D.  Initially couldn't get the autofocus working using al servo sport mode.  No sound, hum, anything out of the motor. Changed the lense to manual focus and on manual camera settings and still nothing.  No pictures at last nights game.  Once home, checked other lenses and found no autofocus issues on the camera.  This is my only short/mid range zoom and use most frequently.

Respected Contributor
Posts: 1,715
Registered: ‎02-17-2016

Re: Canon EF-S 18-135 IS STM manual and auto focus not working

Sounds like you need to send it to Canon.

Esteemed Contributor
Posts: 3,341
Registered: ‎06-25-2014

Re: Canon EF-S 18-135 IS STM manual and auto focus not working


burlyal wrote:

Went to shoot pictures yesterday at my son's baseball game and took only one lense, the EF-S 18-135 3.5-5.6 IS STM on a EOS 70D.  Initially couldn't get the autofocus working using al servo sport mode.  No sound, hum, anything out of the motor. Changed the lense to manual focus and on manual camera settings and still nothing.  No pictures at last nights game.  Once home, checked other lenses and found no autofocus issues on the camera.  This is my only short/mid range zoom and use most frequently.


Canon's STM lenses rely on an electric motor for focusing, even in manual-focus mode. So before you send it in, make sure you've tried it with a reasonably well charged battery. Maybe you'll get lucky.

Bob
Boston, Massachusetts USA
New Contributor
Posts: 2
Registered: ‎04-07-2017

Re: Canon EF-S 18-135 IS STM manual and auto focus not working

I"ll do that Robert.  I had questioned the battery but the readout showed over 50% at the time of use yesterday. Lens was part of a package when purchased 3 years ago and I'm wondering if it does have to be sent in for repair, if it's not just as well to replace with a rebuilt or Sigma equivalent.

Respected Contributor
Posts: 1,715
Registered: ‎02-17-2016

Re: Canon EF-S 18-135 IS STM manual and auto focus not working

That is a good lens, and should last years. It is certainly worth seeing what it would cost to repair it.

Esteemed Contributor
Posts: 4,712
Registered: ‎08-13-2015

Re: Canon EF-S 18-135 IS STM manual and auto focus not working

Robert is right.  The "STM" lenses do not use a mechanical connection to the focus ring.  They operate electronically, also known as "focus by wire".  This means that if your viewfinder display isn't active, then you will not be able to manually adjust the focus.  Half press the shutter to "wake" the camera up, so that you can manually focus an STM lens.

 

Using AI Servo can be tricky, because it cannot give you focus confirmation beep like One Shot mode does when it locks focus.  Because AI Servo mode continuously focuses on a subject, it could beep non-stop if it gave you a confirmation beep.

 

Test your lens by switching the lens to AF, and the camera to old reliable .... the green [A] mode.  Make sure you have sufficient light and distance to the subject.  If the lens still doesn't focus, then it probably needs service.  You would need to contact Canon U.S. Support at 1-800-OK-CANON.

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Honored Contributor
Posts: 7,694
Registered: ‎12-07-2012

Re: Canon EF-S 18-135 IS STM manual and auto focus not working

burlyal,

I don't think it is a great candidate for repair unless it is something really simple and minor.  I see this lens going for around $200 to $250 on the used market.  It is hard to get any repair done for less than $200.  You will have to ask Canon but if you do decide to do it, you will get a virtually new lens back.  They will go through the whole lens.  One reason it costs so much.

A lot of Canon stuff. Along with, a lot of other stuff.
Honored Contributor
Posts: 7,694
Registered: ‎12-07-2012

Re: Canon EF-S 18-135 IS STM manual and auto focus not working

[ Edited ]

BTW, it is unlikely it is the battery. Also unlikely dirty contacts but if it makes you feel better you can try to clean them.  Who knows that may work. Cleaning the contacts is usually a waste of time.  But if you must, use a q-tip and alcohol.  Both camera and lens.

A lot of Canon stuff. Along with, a lot of other stuff.
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