Re: homebrew beam splitter

[P3D Larry Berlin <lberlin@xxxxxxxxx>]

>Date: Wed, 24 Sep 1997
>From: P3D Norman writes:
>...................
>      It seems to me that one problem with the proposed home-brew beam
>splitter as represented by the presented schematic is that the perspectives
>of the perceived images at point A and B will be identical, resulting in a
>perfectly flat stereo pair.  The transmission of light (and image) goes
>through the mirror to camera A, and is bounced off the mirror at exactly the
>same place to camer B.  ................

Actually, the arrangement allows you to use whatever different perspective
you need for the ideal stereo pair, without any of those choices interfering
with the other camera's view. In reality the camera seeing the reflection
isn't looking at the identical point on the mirror of the light transmission
to the other camera. That's why the half-silvered mirror idea works. The two
perspectives required for stereo are so close together any other arrangement
would be more difficult. Yes, you could arrange to take a pair that produces
identical perspectives, but that's specifically *not* the intention.

Larry Berlin

Email: lberlin@xxxxxxxxx
http://www.sonic.net/~lberlin/
http://3dzine.simplenet.com/


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