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Topic:
Help with Projector and Screen
This thread has 4 replies. Displaying all posts.
Post 1 made on Tuesday June 11, 2002 at 20:06
AHT
Founding Member
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May 2002
17
I have a customer with a 24 foot long by 15 foot wide boardroom. They want to mount the projector from the rear wall. After reseaching it seems to not be a problem as long as I get a bigger screen. The picture will not be able to fit the screen perfectly but it will fit "in" the screen. My question is, does the top of the lens have to be the same height as the top of the screen? Or can I angle the projector down? By the way the projector is an LP335 Infocus with the possiblity that they will buy an LP280, same specs. Also what would be the best way to blanket the room with IR receivers, wall or ceiling mount and how many? Thanks for any help?
Post 2 made on Tuesday June 11, 2002 at 21:44
ngavchris
Founding Member
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March 2002
103
AHT
Be careful with a board room projector. You need to make sure you dont get so big that you lose you brightness. Generally boardroom's are not totally dark as a HT would be, keep this in mind. Also check on the type of computer display the customer will generally be working with. (EX: 800X600 or 1024X768) As far as the height of the projector, with single lense projector's they are ususally forgiving on the height. LOL
Post 3 made on Wednesday June 12, 2002 at 00:52
Larry Fine
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August 2001
5,002
AH, the lens alignment with the screen is almost always adjustable for table or ceiling mounting, so should not require the kind of lining up you mentioned. The concern is that the sides of the projected picture are parallel. This requires being able to adjust for what is known as "keystoning".

A keystone is shaped like a trapezoid, where the top and bottom are parallel, but the sides are not. A picture projected from above or below the screen centerline will exhibit keystoning, unless this is adjustable within the projector.

Larry
www.fineelectricco.com
Post 4 made on Wednesday June 12, 2002 at 01:39
kabster
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July 2001
1,606
The brighter the projector the better the contrast .(with some exceptions.
Is it a fixed screen ?
you can get a fixed lens as long as you give them the specs i.e.. distance , W x H angle of throw . (less expensive usually)
If the room could change get adjustable.

As to ir try 1 to start . If you don get the required coverage put one in each opposing corner ,you can always add more. Keep
them away from floressents and direct sun , unless you get cfl friendly (they don't always fix the problem)

Don't blind the target by being too close to screen with it.


This message was edited by kabster on 06/19/02 02:23.01.
Post 5 made on Tuesday June 18, 2002 at 23:50
HNick
Founding Member
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August 2001
33
Many projectors have a "drop" spec - NEC for example - where they offset the lens slighlty to move the image away from the ceiling, something around 10 - 11 inches. Don't know about the Infocus - check their web site (or AVSForum.com). Be careful with keystoning as it will affect image quality (probably won't matter with PowerPoint slides, but will with TV/DVD/etc). HNick


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