Z1-p body

Hi,

Am I correct in assuming that the contact on the lens mount that is used to power the 28-105 zoom will also drive the autofocus motor on the latest Pentax lenses?

I know the K-5 uses the focus motor contact to drive the power zoom, so I assumed it would work the other way around.

Thanks.

Unless it's mentioned in the specification for the Z1-P
I wouldn't think so.

Also have a look at the Dimitrov site to see when the 1st lens
with that motor was introduced. If it's not an FA lens it's
most unlikely that one would work.

AFAIK these contacts will not drive an SDM motor. I know I've tried a Bigma with an MZ-10 and it wouldn't AF.

I just wish Pentax had kept Power Zoom on all the DSLR bodies. I've got one of the lenses but my K-m doesn't support it.

The K10D supports PZ OK and I'm sure my K20D will, never tried it
though..... I'll have to dig out the old 28-80mm which has PZ
to check. I used to use it quite a bit a few years ago on longer
zooms.

K20D does support PZ, I have the 28-105.

John

Thanks John...... Handy to know

Power Zoom Contacts in Film bodies will not drive the motor in SDM lenses, they will supply power to it but the lens also needs additional AF information via the mount contacs so the SDM motor will not function. Also I cant think of any SDM lenses that are designated DFA, DA lenses are designed for APS-c sensors and so the outer edges of the frame on a 35mm camera will suffer.

Hi Algi, I've not used mine much lately but keep thinking it may be good for the steam specials as I rarely need anything wider than 28mm, I wonder how fast the focussing speed is:

John

Is it a case of internal wiring in the lens, because the contact on the lens mount is in the same place. I suppose on the Z1-p it is live all of the time from the body side, so that the lens can use it for the zoom whenever needed.

I think I will need to check this out with Pentax technical.

From what I've seen, Pentax seem to have kept PZ on the more expensive bodies and those with rechargeable batteries. The K7 will do it but not the K-m/K-x/K-r which are designed to be able to run from AAs. Presumably they decided that there would be too much current draw from AAs to ensure 100% reliable operation.

I have found that my K-5 body will power the zoom on the 28-105 f/4 lens.

The PZ functionality didn't offer too much additional functionality and drained the Z-1(p)'s 2CR5 battery too much to be of any real use. I used mine almost exclusively in manual zoom at the time.

The Z-1(p) doesn't know anything about SDM lenses and doesn't have the logic to focus them using the SDM system (then again it was released almost 20yrs before SDM!).

The K-5 will power-zoom the PZ lenses although without the special zoom modes of the Z-1(p) (it still doesn't really offer anything but drains the battery less).

Agreed, it is not much use without the focus tracking.