Keystone Projection Question

humboldtkid · 10-16-2009, 12:56 PM

I'm starting a new project that involves projectors. The projected image needs to be precise, and what I've been noticing is that when a projector is keystoned it loses it's true 16:9 aspect ratio. Is this true of all projectors or only the one I am using now?

What is this functionality called, and in the future, if I purchase a quantity of projectors, what is the spec that I need to look for that allows for this aspect ratio to stay true?

I am also concerned with the life of the bulb. If I am to install a projector, do you have a specific projector that has a longer bulb life than 3000 hours?

This installation is going to be running continuously for days on end, years at a time. I need a projector and a bulb that can withstand this heat. These are only the beginning of the questions. Is there a forum that I can post to or an expert that I can get connect with that might be able to answer more of these types of questions?

Thank you, Dustin Grella

d6500k · 10-16-2009, 01:26 PM

Every projector will have a "Lens throw and PJ distance/placement" chart in the setup manuals. If you follow the direction implicitly, "keystone" will not be an issue. You are correct that PJ's that have a keystone reduction protocol will reduce the number of pixels used in most cases thereby reducing definition, but this is a minimal loss for all but the most discriminating. Lens shifting is preferred, but correct placement is the best answer.

Doug k

Chris Gerhard · 10-17-2009, 03:58 AM

No projector manufacturer guarantees bulb life greater than 3,000 hours, at least none I have ever seen. Some may offer an estimate greater than 3,000 and you might find some consumer claims that a specific projector averages more than 3,000. The problem is usually any projector you are going to consider is relatively new and there is no history to rely on in that regard. My personal experience and what I have read makes me believe 3,000 hours is on the high side, especially if you want a bright image. I have replaced a couple at just over 2,000 hours because I wanted a brighter image again.

Chris

10-16-2009, 12:56 PM	#1
humboldtkid What is HD? Join Date: Oct 2009 Posts: 2	Keystone Projection Question I'm starting a new project that involves projectors. The projected image needs to be precise, and what I've been noticing is that when a projector is keystoned it loses it's true 16:9 aspect ratio. Is this true of all projectors or only the one I am using now? What is this functionality called, and in the future, if I purchase a quantity of projectors, what is the spec that I need to look for that allows for this aspect ratio to stay true? I am also concerned with the life of the bulb. If I am to install a projector, do you have a specific projector that has a longer bulb life than 3000 hours? This installation is going to be running continuously for days on end, years at a time. I need a projector and a bulb that can withstand this heat. These are only the beginning of the questions. Is there a forum that I can post to or an expert that I can get connect with that might be able to answer more of these types of questions? Thank you, Dustin Grella

10-16-2009, 01:26 PM	#2
d6500k ISF Technician Join Date: Jul 2005 Location: Oregon Age: 56 Posts: 1,038	Every projector will have a "Lens throw and PJ distance/placement" chart in the setup manuals. If you follow the direction implicitly, "keystone" will not be an issue. You are correct that PJ's that have a keystone reduction protocol will reduce the number of pixels used in most cases thereby reducing definition, but this is a minimal loss for all but the most discriminating. Lens shifting is preferred, but correct placement is the best answer. Doug k __________________ Website: www.6500kcalibrations.com Serving Oregon, Washington and Idaho. Twice yearly tours to St. Petersburg/Tampa Fla. & Southernmost Texas.

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10-17-2009, 03:58 AM	#3
Chris Gerhard High Definition is the definition of life. Join Date: Nov 2005 Posts: 8,207	No projector manufacturer guarantees bulb life greater than 3,000 hours, at least none I have ever seen. Some may offer an estimate greater than 3,000 and you might find some consumer claims that a specific projector averages more than 3,000. The problem is usually any projector you are going to consider is relatively new and there is no history to rely on in that regard. My personal experience and what I have read makes me believe 3,000 hours is on the high side, especially if you want a bright image. I have replaced a couple at just over 2,000 hours because I wanted a brighter image again. Chris