SL3D some more

[P3D <PK6811S@xxxxxxxxxxxxxx>]

Allan, I suspect you, like me, are tempted to follow the example of early
European explorers and resort to shouting to make those d**n heathen
understand :-)  However, we still have a few untried words yet.

I haven't read the Q-dos patent so don't know what they thought
was going on in their lens (more penance needed here :-),
but here is a simple experiment using a magnifying or other large
simple lens.

Examine your hand with the magnifier.  Using both eyes you should
see your hand in 3D, because your two eyes have different perspectives.
Holding the lens between your eyes and your hand does NOT eliminate
your stereo base.  The two views are imaged separately behind the
stops (pupils) via separate lenses and retina.

In a single-lens situation where the two stops share
the same back lens and same retina/film, the images are
distinguished by removing complementary wavelengths with
red-blue filters.

In the Q-dos implementation (as described by Peter) the two
semi-disks serve as two separate stops - one for red and one for
non-red, which could be verified by putting on red-blue glasses
and looking through the front of the lens toward a light source.
Peter's Q-dos manual also encourages a wide aperture for enhanced
3D effect, which is consistent with the 'weighted center' model as
well as my mask experiments.

I'll go out on a limb here and state that a stereo base consists
of two horizontally separate stops, and that any glass is just
for image enhancement :-)

Paul Kline
pk6811s@xxxxxxxxxxxxxx


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