P3D Re: IMAX glasses

[roberts@xxxxxxxxxxxxxxxxx (John W Roberts)]

>Date: Tue, 30 Dec 1997 09:10:49 -0700
>From: fj834@xxxxxxxxxxxxxxxxxxxxx (Dr. George A. Themelis)
>Subject: P3D Re: IMAX glasses 

>>As I mentioned in my last post, polarization is
>>inherit in LCS glasses but Imax was clever enough to cross polarize,
>>in case the LCS system failed (Michael Kaplan reported) and/or to
>>enhance the LCS system.

>Do they routinely project using polarizing filters in the
>projectors even when using LCS glasses?  This would mean a substantial
>loss of light.  

To people who *aren't* wearing the LCS glasses, yes, but not so much to
people who *are* wearing the LCS glasses, if the direction of polarization
in the projected images matches up to the front polarizers of the LCS glasses,
and if the people in the audience don't tilt their heads too much.

John R


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