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
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