Re: The genius of SR

[P3D Dr. George A. Themelis <fj834@xxxxxxxxxxxxxxxxxxxxx>]

>If the RB viewer lenses were large enough that the
>interocular adjustment were not needed, then the RB viewer would not
>have the "vanishing mounting errors feature" I described.  Because
>these window errors are common in commercially mounted Realist format
>slides, perhaps this concealment of window errors was necessary for
>stereo photography to develop the mass market appeal it had in the 50s!

In case you are serious in saying this, here are a couple of comments:

1. The size lenses in the RB are, I believe, dictated by economics.  Larger
lenses are very expensive.  20 mm diameter appears to be a standard size
used in many Realist-format stereo viewers.

2. Commercial mounting of Realist slides should reproduce the window at the
same always location (around 7 feet).  Any window problems are the fault of
the user (having objects too close to the camera) and not of the commercial
mounting.

3. The existence and correct placement of the stereo window has always been
of secondary importance for mass market appeal.  Stereo views became
enormously popular without any attention to the stereo window.

4. I am not sure I understand the "vanishing mounting errors feature" that
you are describing, but for me, the window is not affected by the change in
interocular distance.

-- George Themelis


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