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Re: [OM] OM-4 diopter adjustment

Subject: Re: [OM] OM-4 diopter adjustment
From: "John Hermanson" <omtech@xxxxxxxxx>
Date: Tue, 8 Jun 1999 21:48:16 -0400
By bottom of the screen do you mean the side facing the prism?  That is the
side  (the matte side) that the image is being displayed on.

John
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----- Original Message -----
From: Chuck Norcutt <norcutt@xxxxxxx>
To: Olympus mail list <olympus@xxxxxxxxxxxxxxx>
Sent: Tuesday, June 08, 1999 8:56 PM
Subject: Re: [OM] OM-4 diopter adjustment


> Maybe this will help clarify the diopter adjustment question... then
> again maybe it'll just muddle it up. :)
>
> The camera lens is acting as a projector.  It's projecting an image onto
> the _bottom_ side of the focusing screen.  The camera eyepiece is like a
> loupe. It needs to be focused also on the _bottom_ side of the focusing
> screen.  Its purpose is to view the image being formed on the _bottom_
> side of the screen.
>
> To cut out the _distraction_ of actually having an image there you first
> remove the lens or else defocus it and point it at a bright, blank
> area.  You then focus the camera's eyepiece on the _bottom_ of the
> focusing screen using the diopter adjustment (or fixed diopter lenses if
> you don't have an OM-3 or 4).
>
> But it's hard to focus on the ground surface itself.  The easiest thing
> to focus on is the rings around the focusing aids in the center of the
> screen.  Since the rings form a continuous line they are easy to see.
> They are also on the _bottom_ side of the screen along with the ground
> surface.
>
> Once the _bottom_ of the screen is sharply in focus then any image
> formed by the lens will also be in sharp focus... provided, of course,
> that you haven't dropped the thing on the concrete and knocked
> everything else out of whack.
>
> Chuck Norcutt
> Woburn, Massachusetts
>
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