Canon's 40D is not on the coke, how to determine the camera or the lens of the problem,
It is best to have extra camera and lens, separate to try to know the case, the focus of the lens can be changed in your bad camera, the bad lens for a good camera
My 40D is the problem, I tried the other lens found everything is normal, that is, the 17-85 sets of head focus is not successful, the lens motor repeatedly in the turn, that is, no coke and light, I suspect that the lens has a problem, and tomorrow ready to take Quick repair center check.
