Charles, I vaguely remember reading something like what you described, but I am not sure if it was talking about the auto focus or some other lens function. When dealing with Canon lenses, the difference in pro and consumer AF functioning has to do with the type of USM (UltraSonic Motor) in the lens. The pro model uses ring-type USM, while the less expensive AF lenses use a micro USM. You can read more at http://www.usa.canon.com/eflenses/technology/ultrasonic.html. peace, rand | Sometime ago I read an article on the web about why pro AF lenses has | faster autofocus than customer AF lenses ... in this article it was said | that pro lenses have its own microprocessor to command the autofocus system | ... the customer lenses don´t, it uses the camera microprocessor for this. | Is it right??? | | | | T+ | | Charles |
