It allows you to have the camera close down the aperture, wait for the
vibrations to stop, and then fire the shutter.
It's all done by just using the self-timer, if I remember correctly.
Tom
> In reading Gary Reese's lens test results, the tests performed with an
OM-4T
> are shown as conducted with "aperture" or "diaphragm prefire". What is
> this and how does it reduce vibration?
>
> Jamie
>
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