From: fmo (fmo@pipeline.com)
Date: Fri Dec 17 1999 - 19:09:36 PST
Message-ID: <001501bf4905$53b1f960$a6c2aec7@u9h2v2> From: "fmo" <fmo@pipeline.com> Subject: Re: Pinhole Digest #313 - 12/17/99 Date: Fri, 17 Dec 1999 19:09:36 -0800
In response to Eric, the two-projector is an easy way to get the 3-D effect,
but certain things must be observed: first, the polarizers should be at 90
degrees to each other and at 45 degrees to the horizontal. Second, the
screen must be metallic, or it will depolarize the light after reflecting
and spoil the effect. For a first try, use two inexpensive slide viewers
(the "peep-through" kind) rather than projectors. A company called Reel 3D
Enterprises (check on-line) sells viewers and other stereo supplies.
I've mounted two 35mm cameras on a board to make a hyperstereo camera (you
can also try two single-use regular or panoramic cameras). While 2 1/2
inches is industry standard for the interocular separation of a stereo
camera, larger separation is more pleasing, especially with scenery. The
effect of exaggerated separation (hyperstereo) is fascinating to experiment
with. Extreme separation makes the subject look miniaturized. The hardest
part is making sure the two cameras frame the scene identically (prints
allow compensation for mis-framing because you can crop).
David Fryman
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