> The AF algorithm is in the camera not the lens. The camera's program > sends the commands to the lens. What makes AF faster on the lense's > side is the AF motor, the number of elements and weight that has to be > moved, etc
While the AF algorithm is in the camera, there is still firmware on the lens side that also makes a difference, else it would be more difficult for the camera to take full advantage of the faster performance of a better lens. This is the problem earlier (maybe still true today) Nikon AF cameras had, since the AF motor is in the body and not the lens, Nikon had to deal with using the same motor to drive everything from a fisheye to telephoto lenses, there's got to be some compromises in the interest of "compatibility" with all lenses... Regards, Ken * **** ******* *********************************************************** * For list instructions, including unsubscribe, see: * http://www.a1.nl/phomepag/markerink/eos_list.htm ***********************************************************
