P3D IMAX Glasses: polarisation

["Sergio Baldissara" <winter@xxxxxxxxxx>]

> From: Allan Woods <allanwx@xxxxxxxxxx>
> To: photo-3d@xxxxxxxxxxxxxxxxx
> Subject: P3D Re: IMAX Glasses...
> IMAX glasses are not just fancy Italian eyewear... The last IMAX3-D
> extravaganza I saw required the wearing of ACTIVE LCD glasses which
> received synch signals through IR sent from above the screen.
> ------------------------------
>
> Date: Fri, 10 Mar 2000 14:59:46 -0800
> From: Eddie Bowers <eddieb@xxxxxxxxxxxxx>
>
> Not these. They are polarized. I think it's turning out to be a cheaper
> lighter alternative for them.
>

> From: donaldparks@xxxxxxxxxx
> Subject: P3D RE: IMAX polarized (was IMAX anaglyph)

I live in Italy and never entered in an IMAX movie hall, anyway I'm sure (I
found them in the Internet) some IMAX theatres use LC glasses. I think all
members of this list can discern between goggles, so probably not all
theatres use the same 3d standard.
Anway I didn't understand why they used plastic framed glasses (needing
disinfection after each use) instead of disposable cardboard specs. I
believe I've found a clue in this:

> From: donaldparks@xxxxxxxxxx
>      There's a new IMAX in Boise Idaho.  I went to see T-Rex and brought a
pair of
> regular stereo polarized clip-ons to try.  I discovered that the
polarization used
> for the IMAX projection is not the standard 45-45 degree orientation.
Their glasses
> were horizontal-vertical orientation.  I couldn't use my clip-ons.

actually L polarization works better than X, but it needs fool-proof specs!
Sergio