A week ago, I shot a few slide-films (Fuji 200) with my old SF1n and a
few different lenses. I used to make many slides in the past, but
changed to printfilm some years ago.
All slides made last week look fine, perfectly exposed - except those
made with the Pentax SMC 4/28-70 which all look overexposed at least one
stop.
I've checked the 28-70, but it looks perfect: aperture goes smoothly,
automatic stop-down mechanisms works fine.
I've compared the 28-70 with another similar model, both "made in
Japan"-versions, and upon visual inspection only one seems to have, at
identical focal length and aparture settings, a somewhat larger diameter
in the selected aperture than the other. To my view, not enough to make
for the one stop overexposure.
But again, both lenses seem to work perfectly.
Is this just a matter of tolerances, and have tolerances in modern
zoom-lenses become that large that they are just too big for slide film
? Does anybody have similar experiences with the 4/28-70 ?
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