Re: PHOTO-3D digest 1379

[P3D Neil Harrington <nharrington@xxxxxxxxxxxxx>]

Allan Carrano writes:

>     >Remember that the images are *upside down* on the film plane, so they
>     >are left-right reversed in the diagram.  Left side of 'reality' is .
>     >focused on the right side of the aperture.
>     >
>     >-Greg
>     
>     NOW I GET IT! --- That's how my Realist, BY DESIGN, masks me down to a 
>     7 ft. window to start with.  Then, any mounting adjustments I make on 
>     individual slides will deviate from that starting point.  Thanks, 
>     Greg.

Allan, I hate to disappoint you, but if your understanding is based on the
"left-right reversed" explanation requoted above, you really _don't_ get it.
Lenses (most lenses) do of course rotate the images 180 degrees at the focal
plane, but that has no bearing on this.  It makes no difference whether the
lenses invert the images, leave them right-side-up, lay them on their sides,
or smear them with raspberry jam, your stereo camera still has to give you
convergent fields of view in order to produce that stereo window.

If your Realist gives you a window at 7 feet, it's because that's the
distance at which the two fields of view cross.  


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