IMO aperture induced vibrations are much like that of
the mirror. Just before the shutter opens, the camera
continues to stop down the aperture as far as it will go.
When it reaches a physical barrier whose position is set
by that of the the aperture ring, it "collides", coming
to a stop causing vibrations. I am not sure if its
magnitude is as serious as that of the mirror's, but
can still make a measurable difference as evidenced
in Gary Reese's tests.
-Tim
> I have wondered before. What is the source of the aperture induced
> vibration with OMs? Is it in the lens mechanism itself or is it in
> the mechanism inside the camera body that activates the auto
> aperture? If inside the body I was wondering whether the action
> could be softened by a modification that would soften the action and
> reduce the vibration. Maybe the introduction of a resilient
> component in place of a hard one somewhere in the process?
> --
> Winsor Crosby
> Long Beach, California
>
>
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