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[OM] Re: Adjusting Focus

Subject: [OM] Re: Adjusting Focus
From: Mark Dapoz <md@xxxxxxxxxxxx>
Date: Wed, 4 Apr 2001 19:03:11 -0400 (EDT)
On Wed, 4 Apr 2001, Kelton Rhoads wrote:

> No need to adjust the position of the focus screen or the rails. I 
> believe Olympus specifies spacers (washers) to be used between the front 
> plate and the body as needed for fine focus correction. Also there are 
> spacers on which the pentaprism rests that are interchangeable. Perhaps 
> John H or Mark D can tell us why . . . is that for "focusing" the 
> pentaprism/viewfinder? My guess is yes. 

Yes, there are spacers between the frame the pentaprism sits in and the 
front casting.  In order to make that adjustment, a special collimater
is needed.  The spacers are in increments of 1/100mm so the measurement
is critical and can only be measured using a collimater.  The purpose of
the spacers is to adjust the focus point of the screen.  I don't have a
collimater so I've never actually tried to make this adjustment.
                                        -mark



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