I believe the problem was more likely caused by inaccurate calibration
(loose tolerance) of both the lenses and the Z-1ps (mechanical coupling). If
print films were used, you would not notice any difference at all.
regards,
Alan Chan
>If this information is correct, it might seem like Pentax have problems
>with
>implementing exact electronic control of Aperture. This can be a design
>problem with the KAF2/FA mount, how the camera exchange aperture
>information
>between lens and body. If so, Pentax decided to leave out electronically Av
>mode in MZ-S due to problems with Z1p. However, I have never experienced
>any
>problems with this.
>
>Arnie
>
> > With all the discussion about the aperture rings, I think one important
> > point is that if you set the aperture ring to 'A' and alter the aperture
> > settings through the body (Z-1p in this case), the "actual" aperture
>might
> > not be what you expected. For instance, I have checked all my Pentax
>lenses
> > on Z-1p (2 of them) and discovered the apertures set by the bodies were
> > actually smaller (phyically) than when set the aperture rings directly
>(even
> > they both gave the same f value). And the worst of all, the magnitude is
> > lens dependent. This could be very frustrating when shooting slides. For
> > this reason, I have not given up the aperture rings even when I use the
> > Z-1p. My test results are as follow:
> >
> > FA*24/2 ('A' is about 1/3 stops larger)
> > FA43/1.9 ('A' is about 1/3 stops larger)
> > FA77/1.8 ("A - 1.8" is not 100% wide open)
> > FA100/2.8Macro ('A' is about 1/2 stops larger)
> > F*300/4.5 ('A' is about 1/3 stops larger)
> >
> > regards,
> > Alan Chan
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