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Author Topic: 2000ZX light output Marco Giustini Film God Posts: 2713 From: Reading, UK Registered: Nov 2007 posted 03-12-2011 01:05 PM                     I am with Brad about the lamphouse. I do agree that it would be the best idea, but this is not the case in the real world, where the average projectionist is a curse for the equipment they are suppose to look after And looking at the issue with real world eyes, I doubt cinemas will all go for anamorphic just to save lamps or to give the best presentation both in 2D and 3D. A mechanical Iris (as you said in the lamphouse to save money, I agree) would be cheap to implement - I reckon. Why not installing an Iris as default, and leave to the exhibitor the best (and more expensive) option of the anamorphic? I agree that driving the lamp high all the time is a waste of money, but at least the presentation would be optimal all the time. At present cinemas are forced to show over-bright 2D picture.  |  IP: Logged Steve Guttag We forgot the crackers Gromit!!! Posts: 12814 From: Annapolis, MD Registered: Dec 1999 posted 03-12-2011 04:33 PM                     Marco...by your own argument (cheap exhibitors won't buy the anamorphic)...also rules out the iris. And, from what I've seen, they, by and large, just don't have the right light levels...Scope is under lit if Flat is properly lit. If you don't vary the light output and you don't do anything to equalize the light, you have can't have proper light for both formats. Again, Barco's lamphouse solution would work for 2D/3D since the only person "aligning" anything is the person that replaces the lamps themselves. it isn't high skill to change the lamphouse. -Steve  |  IP: Logged Kris Verhanneman Expert Film Handler Posts: 182 From: Belgium Registered: Dec 2009 posted 03-13-2011 05:17 AM                     And how would you proceed when they program you 14h30 2D screening 16h15 3D screening 18h15 2D screening ... 20h 3D screening ... ? Asked the same question to our technicians when they installed our first 3D dolby screen.  |  IP: Logged Marco Giustini Film God Posts: 2713 From: Reading, UK Registered: Nov 2007 posted 03-13-2011 06:53 AM                     or in a fully automated booth like Brad's. If the Iris is as expensive as an anamorphic, then you may be right! About the light output, the idea was to design the system bearing in mind the less efficient format (Scope, 3D) and then adjust the iris for other formats. You could also adjust the rectifier power to save energy, and have the Iris to help when that is not enough.  |  IP: Logged Steve Guttag We forgot the crackers Gromit!!! Posts: 12814 From: Annapolis, MD Registered: Dec 1999 posted 03-13-2011 06:56 AM                     You could do it with the Barco lamphouse. But what we really need is the lamp-turret with up to 4 lamps (FLAT/SCOPE 2D/3D)...or just 2 Lamps and an anamorphic (my preferred way). If you have constant width screens...then just the 2-lamp turret would be sufficient. -Steve  |  IP: Logged Marco Giustini Film God Posts: 2713 From: Reading, UK Registered: Nov 2007 posted 03-13-2011 07:51 AM                     Lamp turret?? You mean multiple lamps in a lamphouse? I'm afraid I have to disagree this time.  |  IP: Logged Kris Verhanneman Expert Film Handler Posts: 182 From: Belgium Registered: Dec 2009 posted 03-15-2011 09:33 AM                     I think the real solution is way different ... available one day I hope. Replace the Xenon lamp by a laser light source. That way you can adjust more your light output to the needs of your screening.  |  IP: Logged Marco Giustini Film God Posts: 2713 From: Reading, UK Registered: Nov 2007 posted 03-15-2011 06:32 PM                     Can lasers be adjusted in brightness?  |  IP: Logged Carsten Kurz Film God Posts: 4340 From: Cologne, NRW, Germany Registered: Aug 2009 posted 03-15-2011 06:39 PM                     Yes, they can. What's more interesting about lasers and 3D: Lasers have a very small etendue - they do not need mirrors and the like. In consequence, you can easily 'stack' laser modules for increased brightness. You might have two or more laser modules in a future 3D machine, both (all) being used for 3D, or only one of them for 2D (switched on alternately between shows to balance wear). There are some dual- or even quadlamp business/E-Cinema projectors with UHP lamps, but that system is quite expensive and complicated to build (even with these smaller lamps) and the light output is still compromised. Usually the largest benefit is automatic lamp switchover in case of failure. - Carsten  |  IP: Logged Marco Giustini Film God Posts: 2713 From: Reading, UK Registered: Nov 2007 posted 04-11-2011 01:14 PM                     Back to the 'keep the right light in 2D' topic, how do cinemas using 10-18% light efficient 3D systems can achieve 14FL on 2D these days? If you have 60FL in 2D at 100%, how do you lower the light on screen to reach 14FL, in the real world?  |  IP: Logged Steve Guttag We forgot the crackers Gromit!!! Posts: 12814 From: Annapolis, MD Registered: Dec 1999 posted 04-11-2011 02:14 PM                     If you have Barco...change lamphouses...quick. Others typically have the light vary (hard on the lamps) and you can't get it to come in properly on both. -Steve  |  IP: Logged Carsten Kurz Film God Posts: 4340 From: Cologne, NRW, Germany Registered: Aug 2009 posted 04-11-2011 02:57 PM                     Well, first of all, it's not so bad to have more than 14fL in general. There's no flicker as with 35mm, so there's no penalty with more light (except energy cost). One should probably swap lamps between 2D and 3D. However, swapping bulbs so often is another risk. Best is to use a 3D system with a better light effciency. Or, if you have enough screens, dedicate one or a few to 3D only and always run it on max brightness. Dual projector 3D is another (expensive) option. Currently, I don't see the ideal solution to that problem. - Carsten  |  IP: Logged Marco Giustini Film God Posts: 2713 From: Reading, UK Registered: Nov 2007 posted 04-11-2011 03:17 PM                     Steve I am wondering what happens in the real world. Barco will not allow to power your lamp less than 50-ish% if I am not mistaken. If you have 60FL at 100%, you can achieve 30ish at 50%. As Carsten pointed out, it's not so bad. But I was wondering: any ways to achieve the DCI standard 14FL on a 3D projector (without replacing anything) these days? Sure, you can do it if you have a RealD-XL, but what about the other systems?  |  IP: Logged

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