> I have used Canon USM lenses for > several years now and the focus is fast and almost completely silent. > Certainly, outside on a street with the odd car, you will not hear it > all. When I use my wife's *ist Ds, it startles me by comparison. > My original point, though, is that it sort of surprises me how everybody takes it for granted that the key element in this high(er) speed is the motor technology. This is far from obvious to me. Like I said, there is some data processing involved, too. Some of that seems does seem to be related to the type of motor, but not where you put it. The ring motor thingy can only be put in one place, obviously, but there are other setups using essentially the same technology...
Noise is a different matter, as there is bound to be *some* sound from the screws and gears. Still, I suspect that Pentax could make a much quieter system by just replacing the motor. Is it true that the AF speed on the *ist Ds is slower than the one on the MZ-5n (which is fast enough for me), by the way? - Toralf -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net
