I have a brief question. I have sitting in front of me a Vivitar 28
2.5 and an Olympus 28 2.8. The aperture ring on the Vivitar can be
set IN-BETWEEN aperture values while the Olympus will only set
itself at the specific f-stops. A 35mm Vivitar also does this.
Does anyone know why Vivitar chose to allow a more flexible aperture
setting? Is this really more flexible? I have never really thought
about it before.
Thanks,
-Bill
Since everyone else seems to have told you why it is better to not
have click detents at the half stop marks, maybe someone should
address your question about why Vivitar did this. :-)
I think the reason is the the Vivitar was designed to be used on many
different cameras, some of which had shutter priority exposure
systems instead of aperture priority exposure like Olympus. On many
of these cameras you set the shutter dial on top of the camera and
adjusted the aperture while looking through the viewfinder at the
display. If the meter, such as an LED display, read between F Stops
you could then set the aperture between F Stops. Meter displays
seldom resolved readings to less than half a stop, so a click stop
made it easy to find the place between a half stop over and a half
stop under exposed. I think that Maitani planned to bring out the
OM2 from the beginning and designed the lenses for an aperture
priority auto exposure system even though it was a while before it
followed the OM 1 into production. I think it is just the difference
between a "custom tailored" and a "generic" design. But I could be
wrong.
Winsor
--
Winsor Crosby
Long Beach, California, USA
mailto:wincros@xxxxxxxxxxx
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