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Re: [OM] Question on Focus

Subject: Re: [OM] Question on Focus
From: Tom@xxxxxxxxxxxxx
Date: Tue, 23 Apr 2002 02:39:30 -0400
On Monday, April 22, 2002 at 22:18, Richard F. Man 
<olympus@xxxxxxxxxxxxxxx>
wrote re "Re: [OM] Question on Focus" saying:

> At 08:58 PM 4/22/2002 -0700, moose wrote:
> >That is why the image seen through the split image area is not useful for 
> >focusing except by it's displacement along the split. It is also an aerial 
> >image.
> >...
> Can you clarify? I mean what other (incorrect) use is there for the split 
> image area if not for the displacement along the split?

Trying to focus on the stuff being split when it's a small pattern which 
means you can't use the split.
 
> Also, what's an aerial image?

A virtual image to which your eyes can adjust, unlike an image on a ground 
glass, where the eyes adjust to the glass, not the image.  

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