in the camera body, period. Except of course for the infamous SMC PENTAX AF ZOOM 1:2.8 35~70mm
that not only contains it's own motor but also it's own power supply.
Which you can see here:
http://www.bdimitrov.de/kmp/lenses/zooms/medium/AF35-70f2.8.html
and read about here:
http://stans-photography.info/LongComments.html#35-70%20mm%20f/2.8%20AF
At 09:50 PM 2/18/04, you wrote:
Hi, does Pentax use the ultrasound technology found in some Canon and Nikon lenses? I have a ZX-5n and I see that it uses a shaft (cannot find a better word) to achieve the auto-focus, IOW the motor is in the camera and there is a mechanical coupling between body and lens. This is not very quiet :(... I see there are a few other contact on the lens mount, so I wonder if other more expensive lenses got the ultrasound auto-focus motor. I only have a zoom 28-70 f/4 AL lens.
what about lenses where the front element does NOT rotate? using a polarizer filter with 28-70 f/4 is not fun. And BTW, while others seem to like the optical quality of this lens, I see very few that actually mention the poor mechanical build.
I drink to make other people interesting.
-- George Jean Nathan
