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Old 22nd of February 2013 (Fri)   #1
mattbardi
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Default lens won't autofocus, help??

I have 2 lenses, 50 and 24 with the mark II. The 50 works fine, autofocus works with it. But I put on the 24 and AF doesn't work. It used to but all of a sudden it doesn't anymore.

Anyone have any solutions?? Aside from the obvious of switching it from MF to AF. Is there settings I can reset or am I just gonna have to send this back to canon?
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Old 22nd of February 2013 (Fri)   #2
Tc202
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Default Re: lens won't autofocus, help??

Clean the contax on the lens and the camera. If that doesn't work send it to canon.
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Old 22nd of February 2013 (Fri)   #3
mattbardi
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Default Re: lens won't autofocus, help??

Quote:
Originally Posted by Tc202 View Post
Clean the contax on the lens and the camera. If that doesn't work send it to canon.
Just wipe it down? How exactly do you clean that
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Old 22nd of February 2013 (Fri)   #4
Josh_30
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Default Re: lens won't autofocus, help??

Usually you clean the contacts by rubbing them gently with a pencil eraser to clean away any residue and make sure it's clean. Then there's the obvious, make sure it's fully locked/rotated onto the camera, AF switch, etc. Try removing/inserting the battery to see if it recognizes it.
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Old 22nd of February 2013 (Fri)   #5
tomj
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Default Re: lens won't autofocus, help??

"Usually you clean the contacts by rubbing them gently with a pencil eraser..."

My understanding is that this is something you should not do, that there is gold plating on the contacts that can we wiped off this way. Use a clean cloth with a little alcohol.
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Old 22nd of February 2013 (Fri)   #6
PUREBRAD
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Default Re: lens won't autofocus, help??

It most likely will not be due to "dirty contacts" if the contacts are not visibly dirty.

Please provide further detail about "won't autofocus." Do you mean it wont adjust focus at all? Or does the lens "hunt" for focus, but cannot lock on subject. Or does the lens pull or push to the stop in one direction and not return?

Are you using single point auto focus, or is the camera choosing the AF point for you.

Additionally, it would help if you provided camera model.
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Old 22nd of February 2013 (Fri)   #7
losangelino
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Default Re: lens won't autofocus, help??

I had to send my 50mm 1.4 to canon for the same problem. They charged me $100 to fix it. Said blades were bent.
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