https://community.usa.canon.com/t5/EOS-DSLR-Mirrorless-Cameras/Canon-T3i-Autofocus-issues/m-p/51921#M72887 <P>This could well indicate a trip to Canon service but whenever things like this happen, it is a good idea to reset the camera.</P><P>Remove both batteries for at least 30 minutes and reinstall them. Confirm that both batteries are in good condition.</P> Mon, 02 Dec 2013 14:03:50 GMT ebiggs1 2013-12-02T14:03:50Z https://community.usa.canon.com/t5/EOS-DSLR-Mirrorless-Cameras/Canon-T3i-Autofocus-issues/m-p/51819#M72886 <P>I'm having autofocus issues with my T3i for the first time. Whether in low light, or plenty of light, it searches back and forth for focus, and most of the time never finds it. When I put it in manual focus and hold the button down half way while searching for focus, only sometimes do I get a beep and red light when I hit focus. I thought it may be a lens issue, but when I tried them on my 7D, there were no issues at all. What could the problem be? The contacts look clean, the lens is locked in completely, and the firmware is up to date.</P> Mon, 02 Dec 2013 04:34:59 GMT https://community.usa.canon.com/t5/EOS-DSLR-Mirrorless-Cameras/Canon-T3i-Autofocus-issues/m-p/51819#M72886 mrbrycel 2013-12-02T04:34:59Z https://community.usa.canon.com/t5/EOS-DSLR-Mirrorless-Cameras/Canon-T3i-Autofocus-issues/m-p/51921#M72887 <P>This could well indicate a trip to Canon service but whenever things like this happen, it is a good idea to reset the camera.</P><P>Remove both batteries for at least 30 minutes and reinstall them. Confirm that both batteries are in good condition.</P> Mon, 02 Dec 2013 14:03:50 GMT https://community.usa.canon.com/t5/EOS-DSLR-Mirrorless-Cameras/Canon-T3i-Autofocus-issues/m-p/51921#M72887 ebiggs1 2013-12-02T14:03:50Z