Re: John!!!

[P3D John Bercovitz <bercov@xxxxxxxxxxx>]

> Again, a lens will produce an "out-of-focus" image for things which
> are closer or farther away from the "point" of focus.  SL3D encodes
> this "out-of-focusness" so we can "see" it.  Close things appear
> closer because they are "out-of-focus" in a way that is "different"
> from things which are "out-of-focus" because they are farther away.
> The encoding allows us to translate that into images which are
> apparently shifted left-right so we can "see" the depth illusion.

You can get rid of the "out-of-focus" by stopping down the two 
apertures from the existing half circles down to smaller circles 
located where those half circles were.  You will get the exact same 
effect.

> Two lenses take two pictures from two different places.
> One lens takes one picture from one place.

Ah!  Here is a very simple experiment you can do to prove yourself 
wrong:  Set up a camera with a ground glass at the film plane.  Cover
the left half of the lens with a piece of paper.  Look at the view.
Now move the paper to cover the right half of the lens.  You will easily
see that this gives you two different views from two different places
using only one lens that has not been moved.

John B


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