Question about Canon EF-S 17-85MM F/4-5.6 IS USM Lens

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Lens auto focus sometimes does not work.

Not sure why this lens sometimes does not autofocus. I try to focus on my subject, the lens focus move left and right and will not focus on my subject. I have no problems with my other lens. In order to solve this problem, I have turn to manual focus. Just got my len over a year ago.
I'm afraid I have to take this to canon shop, hopefully there is a solution. changing the battery on my camera does not help either. Thank you.

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Re: lens auto focus sometimes does not work.

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 )
#1880e583.jpg #2 d5f637d.jpg

Posted on Nov 26, 2007

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My Nikon Nikkor 18-135mm f/3.5-5.6G ED-IF AF-S for Digital SLR lens does not seem to auto focus well. Sometimes the lens will focus and unfocus and refocus constinely. Is this normal??

You did not say which camera body you are using, but you probably have three different auto-focus modes on you camera. You might be using the wrong one.

The modes are as follows:
AF-A Mode: Camera automatically selects single-servo autofocus when AF-A subject is stationary, continuous-servo autofocus when subject is moving. Shutter can only be released if camera is able to focus. AF-S Mode: For stationary subjects. Focus locks when shutter-release button AF-S is pressed halfway. Shutter can only be released when in-focus indicator is displayed.
AF-C Mode: For moving subjects. Camera focuses continuously while AF-C shutter-release button is pressed halfway. Photographs can be taken even when in-focus indicator is not displayed.

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I have a Sigma 24-70 2.8 EX DG Autofocus will not work.

Call Sigma. Here is the information. They will be able to help you for sure. To request assistance by phone in the US, their technicians are available from 9AM to 5PM Eastern Standard Time, Monday through Friday. Please call: (631) 585-1144.
Customer Service Department call toll free (800) 896-6858.
You can also fax them 24 hours a day.
Fax: (631) 585-1895 or (631) 585-7661

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Hi, It wouldn't autofocus on the D5000 as the body doesn't have an auto focus motor in the body and since that lens is AF, not AF-S, it won't autofocus. It should autofocus on the D7000 though, how far away are you from the object you're trying to photograph?

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You may just have the left auto focus points selected. You don't say which camera model you have. If on the back of your camera you can see a button with an icon showing 5 small white blocks in a plus sign in a white box press this to select the auto focus points. It should show the available auto focus points and then use the left/right (wheel) button to change the selection

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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.

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1 Answer


I would send it into sigma. They are in NY,
They are really quick about checking things out and I have neverhad them charge me to look at a lens and tell me whats up. aot of times they will just fix it while it there is it looks like something is worn out from normal use.
its a great lens. Some would say its a slower focus. than the Canon brand and you do get what you pay for but its hard to spend as much on canon lenses as they want. :)

Hope that helps,

Jan 25, 2008 | Sigma 24-70mm F3.5-5.6 AF Zoom Lens

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