[photo-3d] Peter Davis post re the Bi-lens viewer

[E R Swanson <ers@xxxxxxxxxxxxxxxxxxxx>]

//from Peter//
The Sawyers Bi-Lens doesn't use a curved mirror.  It has an arrangement of
front-surface and half-silvered (beam-splitter) mirrors that direct the
same image to both eyes.

The Realist Real-a-rama uses a curved mirror, but it's not lighted.

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Peter, right you are-- I just dug it out of the closet. I'd mixed up the
two-- it's been quite a while since I built it, and I have both types of
viewers in my junk bin. However, all the instructions still apply-- the
Bi-lens can easily be converted for anaglyph slide viewing for slides shot
with the Q-Dos or the commercially sold anaglyph slides. It's very easy to
take apart and retrofit.

--Elliott