I didn't realize Canon did that. That would help them shave weight from the body. Nikon is split. The older AF lenses are driven by a motor in the body. The newer AF lenses have the cool ring motors. (And, apparently, the Nikon pro bodies have bigger, stronger motors, so they'll focus the older AF lenses faster than the consumer bodies.) Canon only uses a ring motor on the 18-55mm zoom that they sell in Asia, but not on the US/Europe version. Nikon's new 18-55mm uses a ring motor, as does their 18-70mm zoom that was the kit lens for the D70.