| I had the same problem when I was out on a shoot the other day with my rebel xt. First and only time I've ever come across that prob.
Scared the crap out of me. I ended up just doing every little thing possible, even the things that didn't make sense for troubleshooting purposes.
I had the camera flip up the mirror, as you would to clean the sensor. Turned it off and back on, and AF started to work just fine again. Do not ask me the logic in that one... lol |