The gears in the lens and the material the lens is made from seems to make a huge difference in the amount of focus noise that Pentax lenses make. The FA 20-35 is much quieter, (plastic body), is much quieter than than the F 70-210 (metal body). The FA 43 seems to make a bit less noise than the 70-210 but more than the 20-35.
Toralf Lund wrote: >>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 > > > > -- Things should be made as simple as possible -- but no simpler. --Albert Einstein -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net