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» Film-Tech Forum   » Operations   » Digital Cinema Forum   » Real-D not polarising properly

Author Topic: Real-D not polarising properly
Thomas Pitt
Master Film Handler

Posts: 265
From: Leeds, West Yorkshire, UK
Registered: May 2007

 - posted 08-02-2017 05:17 PM      Profile for Thomas Pitt   Email Thomas Pitt   Send New Private Message       Edit/Delete Post 
I went to see the new Valerian (City of a thousand planets) movie today in Real-D 3D. The movie started, but there was no 3D - both images were going to both eyes. Many people went out and complained!

This sort of thing has happened before; it usually means that the polariser is not in front of the projector. This time however, the polariser WAS in place, just not doing its job! I could see the staff adjusting the projector; the 3D spacing and phase kept changing. About 8 minutes into the movie they finally got it working again, and very kindly restarted the movie from the beginning so we could see it all in proper 3D.

They didn't have to restart the server or projector - so what do you think caused this issue? Have you ever had similar issues with a Real-D system like this? Also I thought the polariser was supposed to be in place at all times, even for 2D films... moving it away could make it go out of alignment!

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Mark Gulbrandsen
Resident Trollmaster

Posts: 16227
From: Bountiful, Utah
Registered: Jun 99

 - posted 08-02-2017 07:50 PM      Profile for Mark Gulbrandsen   Email Mark Gulbrandsen   Send New Private Message       Edit/Delete Post 
They likely had the wrong macro programed in.

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Monte L Fullmer
Film God

Posts: 8318
From: Nampa, Idaho, USA
Registered: Nov 2004

 - posted 08-03-2017 02:11 AM      Profile for Monte L Fullmer   Email Monte L Fullmer   Send New Private Message       Edit/Delete Post 
Sometimes, that S-video cable that attaches to the Z-screen can get funky connections.

If the decoder box is displaying normal RealD operation, it's usually that cable. They should unplug and plug back in that cable.

It's best to have that Z-screen out of the way for 2D presentations.

good luck - Monte

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Frank Cox
Phenomenal Film Handler

Posts: 1978
From: Melville Saskatchewan Canada
Registered: Apr 2011

 - posted 08-03-2017 03:09 AM      Profile for Frank Cox   Author's Homepage   Email Frank Cox   Send New Private Message       Edit/Delete Post 
My Z-Screen is on a little track that allows me to slide it over out of the way when I'm playing a 2D movie. If it's left in place the picture is dimmer than it can and should be.

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Tom Bert
Expert Film Handler

Posts: 100
From: Belgium
Registered: Apr 2010

 - posted 08-03-2017 04:57 AM      Profile for Tom Bert   Email Tom Bert   Send New Private Message       Edit/Delete Post 
Could be wrong (dark) time settings, indeed through wrong macro

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Dave Macaulay
Film God

Posts: 2136
From: Toronto, Canada
Registered: Apr 2001

 - posted 08-03-2017 11:00 AM      Profile for Dave Macaulay   Email Dave Macaulay   Send New Private Message       Edit/Delete Post 
It's not likely a dark time or other 3D file error, that doesn't change and it's very doubtful that anyone at a theatre could adjust it.
If it's a Z-Screen the cable connection is the likely problem. The connectors don't latch in and often get pulled out a bit when moving the screen.
An XL doesn't have that problem as the D connector does screw down.
The wrong macro would definitely lose sync, on an IMB system it would look OK (but no 3D) but on a system with SDI input the colour would be totally wrecked, green or purple (don't recall which way is which - 2D in 3D or 3D in 2D).

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