The 7D features a 19-point AF system. This is, quite simply, one of the cleverest focusing systems I have seen for a long time. Not only can you automatically or manually select AF points, but you can also use different modes to help you make the most of the system.
For instance, there is a Zone AF system, which groups the points into five zones to help you concentrate the camera’s attention on the part of the image you wish to focus. There is Spot AF and AF Expansion, and you can program the camera to jump to a certain mode, depending on its orientation.
Everything is geared toward helping you ensure the image is in focus. Honestly, you would have to make a real effort not to have an image in focus!