--- Ken Lin <[EMAIL PROTECTED]> wrote: > 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.
Well, cameras with a better AF algorithm can autofocus faster then other bodies. Of course it is possible that autofocus speed depends on both the firmware in the lens as well as the camera. But is that really the case for Canon? In other words can Canon lenses with the same AF motor and mechanical configuration be faster/slower depending only on the firmware? You seem to say so. Can you elaborate more on that? > 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... Well, regarding compatibility Nikon's original approach should have been a good solution. Basically the lens is dumb and autofocus is controled only by a mechanical interconnection. An upgrade not only of the AF algorithm but also the motor in the camera can improve AF performance for a particular lens. But this approach has other limitations which made Nikon depart from that way. That departure created the incompatibility problems because suddenly lenses needed more information from the cameras(so newer lenses don't work with oder bodies that don't send this information and newer bodies don't work with older lenses because the mechanical interconnection was finally replaced with a pure electronic interface). At least that is my understanding. I might be wrong here as I don't know too much about Nikon. Robert __________________________________________________ Do You Yahoo!? Send your FREE holiday greetings online! http://greetings.yahoo.com * **** ******* *********************************************************** * For list instructions, including unsubscribe, see: * http://www.a1.nl/phomepag/markerink/eos_list.htm ***********************************************************
