The genius of SR

[P3D Paul Talbot <ptww@xxxxxxxxx>]

DrT wrote:

>>Apparently you are viewing slides with some convergence even at >>infinity.  Most people use it like that.  I used to do that and then
>>realized that bringing the lever closer to the center was OK too and
>>some times better...

And I commented:
>Sometimes bringing the lever closer to center is better for me, too,
>because it lets me pretend I don't have a mounting problem with the >slide!

I was going to ask if Grant could find some Realist viewer factoids for
us to explain some RB viewer design features!  But I think I'm starting
to understand:  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!

Paul Talbot


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