Hi Wayne, Barry and all,
I think this is not quite right.
An event (such as shutter stop-down mechanism operating) which may
(does) set off vibrations can have effects that follow / apply outside the
period
of time of the actual event.
What can happen, and as I interpret what Gary Reese thinks, and which also
fits in with my understanding of physics and engineering, is that such an
event can set up a train of vibrations which (in the case of an OM) could
destabilise lens component location, and film placement behind the shutter.
And probably other important things I have not thought of.
This train of vibrations will decay over some period of time. Pluck a guitar
string. The sound is a certain loudness at the start, then it fades away. All
things, even the earth, are subject to vibration, and it usually decays (fades
away). It is probable / certain that similar phenomena occur in camera
systems.
I think that compur shutters in lenses have a lot going for them as
alternatives to focal plane shutters, in this regard.
Brian
> Date: Thu, 17 Oct 2002 17:22:55 -0300
> From: "Wayne Culberson" <waynecul@xxxxxxxxxxxxxxx>
>
> BB Bean wrote:
> >
> > 1) It is worth noting that the only vibration we're concerned with is that
> which happens while the shutter is open. It can rock like the New madrid
> fault before
> > and after as long as its doesn't move while the film is being exposed.
> Your instruments may not have accurately isolated that particular time
> slice.
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