3D IMAX

[ray@xxxxxxxxxxxxxx (Ray Hannisian)]

John Roberts writes:

>From previous posts, the Imax theaters that use
>the liquid crystal glasses have a dual projection system, so it's possible
>that the glasses are switching at 144Hz. (Anybody know for sure?) That would
>result in very low flicker, though field-sequential stereo systems inherently
>have problems with very fast motion.

Yes, Imax glasses shutter at 48 fps.  I was lucky enough to get a privete
tour of the projection booth in NYC last July, from an IMAX executive who
had been involved in both the development of the 3D system, and the actual
production of the "Wings of Courage" film that I went there to see.  He
said that the relatively low brightness of film (compared to TV ) prevented
any visible flicker.  I was also give a 70mm frame of IMAX film as a
souvenier.

Ray Hannisian

Ray 3D
Stereoscopic Imaging
http://www.ray3d.com

ray@xxxxxxxxx



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