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lens won't autofocus, help??

FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses
Thread started 22 Feb 2013 (Friday) 14:23   
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mattbardi
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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?

Post #1, Feb 22, 2013 14:23:39




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Tc202
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Clean the contax on the lens and the camera. If that doesn't work send it to canon.

Post #2, Feb 22, 2013 14:33:29


Thomas

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mattbardi
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Tc202 wrote in post #15640851external link
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

Post #3, Feb 22, 2013 14:42:09




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Josh_30
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Joined Oct 2008
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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.

Post #4, Feb 22, 2013 15:01:39


GEAR LIST 5D Mark III/G11/60D/580EX II/430EX/430EX II/Tokina 10-17/17-35 2.8L/24-70 2.8L/24-105 4L IS/70-200 2.8L IS/EF 50 1.4/EF 85 1.8/TAMRON SP AF 1.4x/TAMRON SP AF 90 2.8 MACRO/Manfrotto 209 & 055XPROB/488RC2/GITZO 1541T/MARKINS Q3T

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tomj
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"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.

Post #5, Feb 22, 2013 15:10:35


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PUREBRAD
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Joined Nov 2009
409 posts
Lyndhurst, NJ
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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.

Post #6, Feb 22, 2013 21:34:31 as a reply to tomj's post 6 hours earlier.


50D / 28-1.8 / 100-2.8L / 200-2.8L / YN565Ex

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losangelino
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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.

Post #7, Feb 22, 2013 21:37:28



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