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Shortest throw and Rear Projection

198 Views 8 Replies 6 Participants Last post by Jeff412, Jul 20, 2001

Jeff412

Discussion Starter · Jul 18, 2001

I am trying to design a mapboard for installation in a small electric utility. I need to be able to project an 8' high image, but it needs to be rear projection so that people can stand very close to the image. I need the shortest throw I can get because I don't have a lot of room. Can I use a mirror to cut the throw distance in half? What type of screen would I need? My budget is around $30k, but somewhat flexible. Thanks for your help.

Jeff

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What would you do with a brain if you had one? --Judy Garland

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kstirman

· #2 · Jul 18, 2001

Mirrors have been mentioned before, and they don't seem like a viable option for this sort of set up. Not only are the primary surface mirrors (might be wrong term) quite expensive, but you'd also loose lumens in the process.

You should also be able to search in the screen forum for info on the requisite screen for rp.

Kelly

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Jeff412

Discussion Starter · #3 · Jul 18, 2001

Ok. If mirrors aren't practical, then what is the shortest distance I can get from a projector and still get an 8' high display. I would even be ok with two projectors. The map that I have to display is 8' high but only 4' wide.

Jeff

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What would you do with a brain if you had one? --Judy Garland

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Dizzman

· #4 · Jul 18, 2001

i don't know where the thinking that you will lose too much light comes from, a decent optical first surface mirror is around 94% reflective. So a 2300 lumen projector would lose 138 lumens. As far as cost goes, there are various different solutions. For space you can go with double or single mirror solutions

A good source would be Hudson Photographic. here is their website... http://www.rearprojection.com/ they have alot of solutions.

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abigpicture

· #5 · Jul 18, 2001

Jeff,

This is easy and will xcost you nowhere near 30K. I just had a customer in Hawai with a similar situation. Post the size of the electircal room or simply the depth that you have to work with....

regards,

John

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Jeff412

Discussion Starter · #6 · Jul 18, 2001

Dispatch is 24'x18' and has an 8'x10' room on one of the 18' walls. The 8'x10' room could be used to project the image onto the 10' wall. I hope that makes sense. Here's my best ASCII representation.

[edit] Ok someone tell me how to make this thing display spaces and you can see what I'm talking about.

___________________________________

| | |

|<---------24'------------->| |

| | 8x10 |

| | |

18' | |______|

| 3x10 |

| ______|

| |

| |

|___________________________|

Thanks for everyones help.

Jeff

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What would you do with a brain if you had one? --Judy Garland

[This message has been edited by Jeff412 (edited 07-18-2001).]

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Rick Ho

· #7 · Jul 20, 2001

Hi Jeff,

There are thousands of similar installations in place. Turn-key systems are available from Da-lite, Draper and Stewart. For a set of drawings visit:
http://www.stewartfilm.com/business_...ional_6.1.html

Before a quotation can be provided you will need to settle on a projector. NEC and Sanyo both make projectors with short-throw lens options (.8 x screen width) designed specifically for these types of installation. They also provide lense adjustment and keystone, critical to setting up these projects.

You are better off consulting with audio-visual companies that speciallize in boardrooms and command and control instllations rather than home theater dealers. They will do these types of installations all the time.

Good Luck,

Rick

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Christopher Calder

· #8 · Jul 20, 2001

With that kind of money I would get this Panasonic SXGA model LCD projector with the optional .7 to 1. ultra short throw lens. It can put out four different light settings, from 1,300 lumens to over 3,000 lumens.
http://www.projectorcentral.com/proj...m?part_id=1239

I would use the new Stewart Black Hawk rear projection screen. I think the street price for the Panasonic is around 12K. Don't know how much the Stewart screen would be. Stewart also sells mirrors. I bet you could do it all for 20K. and watch HDTV movies on it during lunch breaks.

Christopher

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Jeff412

Discussion Starter · #9 · Jul 20, 2001

Rick,

Thanks for the information. I will give stewart a call. I agree that I don't need home theater help, but this is the only place that I knew of that even talked about projectors.

JVC is supposed to have a D-ILA coming out that is SXGA and 1300 lumens for under $10k. I don't know about the bulb life though. It may be something I will consider.

Jeff

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What would you do with a brain if you had one? --Judy Garland

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