Hi, I recently purchased a secondhand Canon 40d. Is the camera meant to autofocus in Av or Tv mode. The camera is not. I have only experience with P&S cameras. SLRs and their features are new to me. I am thinking it could be one of the custom function setting has been set by the previous owner to be this way. :Edit: I am using the 40d paired with a Canon 50mm f1.4.