Can a camera lose its ability to focus?

Started Apr 17, 2009 | Discussions thread
Roy Helge Rasmussen Regular Member • Posts: 212
Definitely: Check for dust on the AF sensors.

I second this. I had the same problem with my old 10D. It refused to get focus lock on center AF point but seemed to work correctly in full auto mode.

A small hair had lodged in the center AF sensor and blowing gently with a rubber blower removed it and AF worked perfectly again.

1) In the menu on you 5D choose "manual sensor cleaning" or whatever it is called.
2) Remove lens

3) inside the mirror box, in the bottom you see some square holes. These are your AF sensors.

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