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Does the Program Mode work properly with non Zuiko lenses? Setting the
aperture accurately depends on a rather accurate relationship between
the location of the stop-down lever and f-stop. The manual cautions
about this, but I'm looking for practical experience.
The manual says the shutter speed may vary by no more than one stop from
the viewfinder indication with the 50/1.2 &1.4 and the 75-150 & 35-105
zooms. I assume this is because the stop-down levers on these lenses
vary from standard. They say proper exposure is still assured. I can see
how this would be true in OTF mode, but it appears ESP mode sets a fixed
speed before firing the shutter and so can't compensate for inaccuracies
in mechanical f-stop setting. Or does it stop down before determining
the final shutter speed?
Obscure stuff, but maybe somebody on the list knows.
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Moose,
Some of the Olympus service info for the 2S addresses this partly
and discusses which OM lenses are not recommended for program mode. Some of
the lenses have a longer aperture settling time or bounce etc. depending on
design and coupling mechanism/springs etc. I made a post on this a very long
time ago which should be in the archives. I seem to remember the variance in
speed could be more like 2 stops under some combinations.
Third party lenses could have longer settle times or different stop down
positions. This could lead to not setting the same aperture that the camera
thinks it is setting because of lever positional difference
I have no insight on ESP mode except that it could still be auto OTF if the
correction is effectively like dialing in a sensitivity correction (like a
different ASA) to normal auto/PGM mode.
Regards,
Tim Hughes
Hi100@xxxxxxx
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