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[OM] Re: Aperture/Mirror Prefire

Subject: [OM] Re: Aperture/Mirror Prefire
From: Pschings@xxxxxxx
Date: Wed, 25 Aug 2004 16:18:15 EDT
Cc: jascione@xxxxxxxx
In a message dated 8/25/2004 4:12:18 PM Eastern Daylight Time, 
jascione@xxxxxxxx writes:

> How is aperture/Mirror Prefire actually performed?  Is this used for
> testing only or are there circumstances where one would perform these
> functions? Thanks for the comments.

On the OM-4(Ti) and OM-2S prefire is accomplished when you use the self 
timer. The mirror moves up and the lens stops down at the start of the 12 
second 
self timer cycle. The OM-1(n) has manual mirror lockup, but no aperture 
prefire. 
I think some of the double-digit OM's (OM-10, OM-20/G, OM-30/F, OM-40/PC) do 
something similar, but I think the mirror only goes partway up before exposure.

I seem to recall the OM2000 did mirror/aperture prefire, and it also has a 
mechanical self timer, so the delay is somewhat adjustable - I think.

Paul Schings

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