P3D non-polarized projection

[SHIELDS@xxxxxxxxxxxxxxxxxx]

Hi!

I decided to try my idea of projecting a non-transposed beamsplitter
format slide for cross-eyed viewing. I chose a Nimslo portrait that
had not been cut apart and remounted (it was shot with an adjacent
pair of lenses). I do routinely mount Nimslo slides in 2X2 mounts,
two images side-by-side, to mix in with my beamsplitter shots, which
are also mounted in 2X2 mounts (convenient, since each pair is on
one piece of film and pre-transposed).

The effect was stunning--the brilliance of my f/1.7 lens throwing
a small image on my projector-box-side screen, and... STEREO!

You do have to be pretty much in a straight line with the screen,
and in front of the projector is better than behind, just to
get closer to the image and see the detail better. It is possible
to fuse the images out to about a 30-degree angle, but difficult.

I was hoping that at this distance, cross-eyed viewing would not
otherwise be uncomfortable, and for me it was so.

To extend this concept, I would have to mount up a special group
of slides taken from my archives--extra shots, and then
test them on some audiences, which would have to be small--two
to four. I would imagine, just thinking about it now, that there
could be four people directly in front of the projector, two
on ordinary chairs and two directly in front of them on stools.
Perhaps two more behind on bar stools or something like that,
for a total of six.

Of course the mounting would be the main difficulty, as I could not
show all my best slides which are already mounted transposed for
viewing in a viewer. This problem could be overcome by putting
a specially-prepared set of front-surface mirrors in the light
path and projecting at right angles (which could help solve
the problem of getting the viewers in a straight line with the
screen) to the screen--the mirrors untransposing the images
from normally-mounted slides.

It all hinges on at least doing tests and finding that the majority
of viewers can do cross-eyed viewing at this distance. I'm operating
on the general assumption that more people can do cross-eyed viewing
than freeviewing (I am one of those that can more easily do cross-eyes)
Worth the trouble? Remains to be seen.

Mark Shields

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shields@xxxxxxxxxxxxxxxxxx
http://www.netcom.com/~northws1/stmatt.htm
"Let the little children come to Me," Jesus said, "and don't keep
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