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» Film-Tech Forum   » Operations   » Large Format Forum   » Imax 3D, Polarising Vs LCD shutters

Author Topic: Imax 3D, Polarising Vs LCD shutters
Phil Connolly
Film Handler

Posts: 80
From: Derby, England
Registered: May 2000

 - posted 09-26-2000 06:37 AM      Profile for Phil Connolly   Author's Homepage   Email Phil Connolly   Send New Private Message       Edit/Delete Post 
I have only seen Imax 3D using the LCD shutter system. The recent Imax 3D installations at Bradford and the London Science Museum use polarisors, is better or worse from a cost or technical point of view?

I imagine polarisors are cheaper.

Anybody got any preference one way or the other?

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John Wilson
Film God

Posts: 5436
From: Sydney, Australia.
Registered: Dec 1999

 - posted 09-26-2000 07:51 AM      Profile for John Wilson   Email John Wilson   Send New Private Message       Edit/Delete Post 
LCD gives you the best results but there are many factors which make them unattractive to the operators of the theatre.

They cut down light, the glasses are much more expensive, they are harder to maintain, they can fail meaning individual refunds.

But they give you the sharpest 3D you've ever seen. You'd swear you are there.

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Dave Cutler
Master Film Handler

Posts: 277
From: Centennial, CO
Registered: Jun 2000

 - posted 09-26-2000 09:42 AM      Profile for Dave Cutler   Email Dave Cutler   Send New Private Message       Edit/Delete Post 
I agree with John, shutter glasses are wonderful, but expensive.

Having kids tear up a pair of polarized glasses at (roughly) $2 a pair isn't bad. A pair of shutter glasses are very expensive (I don't know a figure) and I would think those installations that use them are constantly repairing them.

Done properly polarized 3-D can look very very good. Just make sure all the componets are high quality.

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John Pytlak
Film God

Posts: 9987
From: Rochester, NY 14650-1922
Registered: Jan 2000

 - posted 09-26-2000 02:09 PM      Profile for John Pytlak   Author's Homepage   Email John Pytlak   Send New Private Message       Edit/Delete Post 
One problem with the polaroid glasses is that tilting the head allows more "crosstalk" between right and left eye images. The LCD shutter glasses allow the patron to move their head without getting "ghosting", but some people (e.g. epileptics) are sensitive to the "flicker" of alternating right and left eye images. I always enjoy testing the LCD glasses by covering the IR sensors on the LCD glasses to make them go out of sync with the projector.

John P. Pytlak, Senior Technical Specialist
Worldwide Technical Services, Entertainment Imaging
Eastman Kodak Company
Research Labs, Building 69, Room 7419
Rochester, New York, 14650-1922 USA
Tel: 716-477-5325 Fax: 716-722-7243

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David M. Huskinson
Film Handler

Posts: 7
From: Las Vegas, NV, USA
Registered: Sep 2000

 - posted 09-30-2000 03:57 PM      Profile for David M. Huskinson   Email David M. Huskinson   Send New Private Message       Edit/Delete Post 
Dave, I think that the PSE 3D glasses are $400 each US. A 300 seat Theatre would need 600 sets minimum at a cost of almost a quarter million dollars. Add in the 'glasses cleaning machines', and the labor to collect, clean and distribute the glasses for each 3D show and it gets quite expensive to use them. It is my understanding that all future Imax 3D Theatres will use the polarizers.

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