Re: Polarized viewing of IMAX 3D

[P3D Alfredo Gonzalez <alfredo_gonzalez@xxxxxxx>]

At photo-3d #1910 Jim Crowel wrote:

>My biggest problem with the IMAX movies is that they can't seem to get the
>convergence right.  I'd originally thought that they were separated beyond
>infinity, but at L5 I did some surreptitious testing & the effect was
>clearly in the opposite direction, i.e. they were having me converge
>somewhere near the tip of my nose.  Possibly they do this on purpose to
>make the images look smaller & closer to life-size.  It may not be a
>problem for people past 40 or so (whose eyes tend not to change focus at
>different convergence angles) but it gives me severe eyestrain.

I agree whith that. I notice at IMAX Port Vell, Barcelona, they don't set an
infinite separation at projection. They simply project both images
superimposed, perhaps because the distance viewer-screen is great (about
15-20m.). The result is the infinite points are on the screen, and the
objects near than infinite are between screen and viewer. No objects rear
the screen. By other hand any object is very close to observer (about
0.5m.). Where set they the stereo window and how much is the maximum on-film
desviation?

Alfredo.


Alfredo Gonzalez
E-mail: alfredo_gonzalez@xxxxxxx


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