In a message dated 00-03-18 21:25:17 EST, you write:
> I'm curious to know if mirror stopdown is the same as mirror pre fire as
> described in Herb Kepplers Pop Photo article.
> I know the OM2000 has mirror prefire off the timer, but are you saying the
> OM4ti and OM3ti doesn' have mirror prefire to lock up the mirror?
>
> My understanding is that the mirror locks up just
before
>
> the shutter releasces and drops after the shutter drops.
> Thanks in advance!
>
> J.S.
>
The OM2S, OM4, OM4T and OM-PC (I think) have mirror pre-fire, which means
that the mirror comes up to its rest at the beginning of the self-timer
cycle. At the end of this cycle the shutter opens and closes. The OM1 does
have mirror lock-up, which is done by means of a small lever on the
camera-body near the lens. The OM3 and 3T have neither mirror lock-up or
mirror pre-fire(via self-timer) being entirely mechanical in their operation
(other than the metering systems.) The tests done by Gary Reese suggest that
mirror pre-fire might be better that mirror lock-up because the diaphragm of
the lens is shut down at the beginning of the self-timer cycle rather than
just before the shutter fires with mirror lock-up.
Warren
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