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5D mk II AF problem

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Mar 1, 2012
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I think one of my sensors is bad/broken, specifically the lower left. Every other sensor grabs focus pretty quickly in good light. Almost exclusively, the lower left will go to infinity and back before stopping, sometimes in focus, sometimes not.

This is a recent thing; I've used the sensor in the past. Any ideas what could cause it and how to go about fixing it?
 
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