Chuck Norcutt wrote:
> It should really be "press the shutter release button" but that's too many
> words and it gets truncated. But there should otherwise be no confusion
> between the shutter and the shutter release button which are two separate
> things.
>
And sometimes quite separated from each other. The shutter release was
simple on early shutters, being a button or lever on the shutter
mechanism itself. On many folders, the Olympus Six, for an on topic
example, the shutter release button on top of the body works through a
lever mechanism to activate that same release on the shutter body.
By the time you get to SLRs, there start to be other actions that need
to be coordinated with the shutter release. On the OM-1, the button on
top is more accurately the mirror/aperture release. The shutter release
itself is buried deep inside and actually tripped by the mirror/aperture
mechanism as the mirror reaches up position.
The mirror lockup doesn't use the same mechanism that raises the mirror
and closes down the aperture during normal operation. It simply raises
the mirror separately. The activation mechanism still goes up and down
under considerable spring pressure when its release is pressed. You can
see easily enough yourself. Without a lens, hold down the aperture stop
down lever on the side of the mirror box and press the release. The
shutter won't activate until you let that lever travel up.
Moose
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