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This topic comprises 5 pages: 1 2 3 4 5
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Author
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Topic: Best 3D for a HUGE screen
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Steve Guttag
We forgot the crackers Gromit!!!
Posts: 12814
From: Annapolis, MD
Registered: Dec 1999
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posted 01-19-2011 10:08 AM
Central (GMT -6:00) (4:08 PM Local)
Okay...lets say you have a Matte white screen (unlikely but certainly possible). Using a single projector and Dolby 3D...you will need 125,546 lumens to get Dolby 3D in spec. for your Scope image. That doesn't seem too likely.
Going to a dual-stack system, you can cut that number by MORE than half to about 56,500 Lumens...still more than any set of current projectors and muster. Use anamorphics (and I highly recommend them for side-masked screens for Scope) and you are down to just 43,500 Lumens. Still more than you can buy from current projectors.
The last bit will need to come from the screen. Use a 1.4 gain pearl and you are down to 26,100 and then you have your choice of all three DLP projectors, Barco DP2K-32B, Chrisite CP2230, or NEC 3200. You will be running 6-6.5K lamps in BOTH machines but you WILL hit 3D light specs WITH Dolby 3D and the lowest gain (greatest viewable angles with the best light). All of this is going to cost a bit...not only to buy but also to keep up with...buring 6K lamps x 2...the most expensive combined with the shortest lived. It will look spectacular though.
Now most will poo-poo the anamorphics and say use a higher gain screen (1.8 or 2.2). The FLAW in that plan is you really only hit your light in ONE place on the screen. Everywhere else you are below spec. Furthermore, even in that sweet spot, if you look even 20-degrees to the left or right, you are again below spec. The anamorphics are a good solution though they are pricey. However, you only need to buy them once. They also allow you to better match your light needs between scope and flat. Just remember, as far as your projector is concerned...when you are running scope, your screen is over 36-feet tall! Without the anamorphic, you are pissing away light to light the drapes.
Note too, if you wait a few months...all of this will translate into 4K (which is here now but I would avoid being on the first wave of most anything in technology). On a giant screen, the greater density of the pixels is going to improve the experience for those sitting closer...even on a 2K master as all projection artifacts are cut by 75%...including convergence.
As for Xpand...there is no dual projector solution, that I am aware of, since they are an active glasses solution..they depend on only one eye showing at a time. As a single projector solution, they could work. You are starting out needing 70,300 Lumens on a matte white. Using anamorphics, you are down to 54,100. With a 1.4 gain screen, you'll just squeak by...with a new lamp. A 1.8 gain screen should get you there with some head room, but not much and you are getting into a notably hot spotty screen. Likewise for the 2.2 gain offerings but you are down to 24,600 lumens...which gives you the proper headroom. However, you are now paying for expensive glasses and have effectively the same nasty dispersion as a silver screen...just that it is white and will have better colors. Your operating costs are lower than the Dolby solution but it certainly will be an inferior show, light uniformity wise.
-Steve
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