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Topic: Trumbull's 120FPS-4K project

Chad Capeland
Film Handler

Posts: 6
From: Pennsauken NJ USA
Registered: Jun 2014

posted 09-08-2016 01:32 PM

Not sure the point. The main benefit for dual projectors is more light. Adding dark time to increase framerate would be really expensive.

We've run dual projectors at 2K/120fps, but they were synchronized. 4K/60fps isn't DCP standard, but 2K/120fps is (sort of). Dual Mirage projectors can do 4K/120fps, but again, we ran those synchronized, and you won't find that hardware in a normal theater.

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Steve Guttag
We forgot the crackers Gromit!!!

Posts: 12814
From: Annapolis, MD
Registered: Dec 1999

posted 09-08-2016 05:58 PM

First off, dual projector isn't the compromise, single projector is. With single projector, one eye is off just over 50% of the time. Think about it, at least 50% of the time, the "other" eye is projecting. And since none of the 3D mechanisms are instant, there has to be a "dark time" where neither eye is projected in order to allow for the 3D mechanism to switch to the other eye (be it a spinning wheel or a active shutter or even a polarizing filter).

So in a dual projector, both eyes are on all of the time. You are merely limited by the projector's 2D capabilities (from its point of view, it is only showing a 2D image). All DCI servers can project 2D at 24 and 48fps (the original spec.). Most servers with traditional mediablocks can handle up to 60fps (2K). So 3D at 60fps 2K can be done by most servers in a dual projector configuration.

The early IMBs also seem to be restricted (due to bandwidth) and may or may not be able to handle beyond 60fps 2D or 24fps 3D (e.g. the first GDC IMB). The later IMBs that can handle high frame rates (including Dolby's CAT745), can handle 60fps single projector 3D (2K) so they can also handle 120fps 2D 2K (same bandwidth). Which means, in a dual projector set up, they can handle 120fps 3D 2K though I don't think Dolby ever implemented dual projector syncing on the CAT745 (someone else may know the actual answer there).

For 4K...the prospects are much more grim. Most of the HFR IMBs can handle 4K30fps 2D (again, same bandwidth as 2K, 2D, 120fps).

Only Barco's Alchemy can currently handle 4K60fps so they should be able to do 4K/60/3D in a dual projector system. My guess is that the studio will be more concerned about getting the 120fps part than the 4K part.

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Steve Kraus
Film God

Posts: 4094
From: Chicago, IL, USA
Registered: May 2000

posted 09-09-2016 12:47 AM

Sean, that is exactly what Trumbull wanted to do. Check the articles from back then. There was just no way logistically to pull it off. So they settled for 35mm / 1.66 blowup vs. conventional 65mm.

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