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This topic comprises 2 pages: 1 2
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Topic: 3D with barco dp2k 10s
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Antti Nayha
Master Film Handler
Posts: 268
From: Helsinki, Finland
Registered: Oct 2008
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posted 07-30-2013 04:13 AM
quote: We did some light tests last week, matt white screen for a site with a 10m scope picture and worries about light for 3D. Running 2D, new 2k lamp, we got 23FL !
Peter: accounting for bulb aging, that's just enough for 2D for you then.
With Dolby 3D and your current screen, though, you'd need about 45 foot-lamberts in 2D to reach 4.5 fL in 3D... And they're already pushing for 7 fL! For any 3D system to be bright enough, you'd need to install a high-gain screen, which would mean severe hotspotting problems (particularly bad if your screen is not curved).
Frank: you'd probably be able to reach 14 fL - or close - in 2D for the whole life of the bulb, if your screen gain is at least 1.4. I'd forget about 3D, though. You'd need a silver screen (which would screw up your 2D image as well) and RealD XL (which has problems of its own).
Dolby 3D and various active systems such as XpanD or Volfoni are simply sold to exhibitors with no license fees, but there's no way past the fact that 9000 lumens won't get you far, no matter which 3D system you choose.
Bottom line: These are not really 3D machines, unless we're talking about small screening rooms.
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Steve Guttag
We forgot the crackers Gromit!!!
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Posts: 12814
From: Annapolis, MD
Registered: Dec 1999
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posted 07-30-2013 05:27 AM
quote: We did some light tests last week, matt white screen for a site with a 10m scope picture and worries about light for 3D. Running 2D, new 2k lamp, we got 23FL !
Sorry...I've got to cry BS on this one. The 10S is a 9000 lumen MAX projector. a 10m wide MATTE white (gain 1.0 or, more likely .9) is going to top out at maybe 16fL and that is without color correction, allowing for port glass loss or...most importantly, any loss in lamp aging. Who measured this screen to be matte-white? What meter were you using? When was it last calibrated? Where you measuring with a full white screen or was it masked down so as to only expose the 2-degree area that your meter should be measuring?
Anyone specifying this projector beyond an 8.8m (29-feet) screen is doing a disservice. Even then, it is going to run hard and by the end of the lamp life, the light output will be significantly below specified output. It is the math of it all. Furthermore, when one runs a lamp in the upper-end of its range, the light output falls MUCH more dramatically (especially true for Osram, by the way).
While going to a gain screen might be a way to stretch available light, it will cause it to fall out of specification as any gain higher than 1.3 on a flat screen (or even the 1:20 screens) will have too much fall off to the sides.
These are small screen projectors (Christie and NEC included)...they should be used on the smaller screens only or you really are compromising the picture. Remember, the light output specification is after color correction...your meter should be showing .314/.351 while it is showing 14fL. Ideally, you should be running a peak-white test pattern from your SERVER while making this measurement as it accounts for the full signal path of the image.
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