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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