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Topic: need a projector with zoom capacity to go from 17' wide to 7' wide.
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Joined: Dec 4, 2015
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need a projector with zoom capacity to go from 17' wide to 7' wide. I'm trying to create two different projection "set ups", in one room that has diverse use. Trying to avoid using two separate projectors, but it will only work if the zoom capacity can hit both sizes. Room is 35' deep.
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You need a projector with a zoom lens which is 2.5x or one with a interchangeable lens and then get two lenses for it.

Keep in mind that a 17' wide screen will have about 6 times the surface area of a 7' wide screen, and must therefore be about 6 times as bright to properly fill it under the same lighting conditions.

That is, on a 40 square foot screen, to get 50 lumens per square foot you go with a 2,000 lumen projector.

At 240 square feet, you need 12,000 lumens to fill it with the same brightness.

So, I'm not sure what your budget is, but I would not consider this an average or typical installation in any manner whatsoever.
AV Integrated - Theater, whole house audio, and technology consultation during the build and installation process in the Washington, DC metropolitan area.
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Quote (AV_Integrated on Dec 7, 2015 1:58 PM):
You need a projector with a zoom lens which is 2.5x or one with a interchangeable lens and then get two lenses for it.

Keep in mind that a 17' wide screen will have about 6 times the surface area of a 7' wide screen, and must therefore be about 6 times as bright to properly fill it under the same lighting conditions.

That is, on a 40 square foot screen, to get 50 lumens per square foot you go with a 2,000 lumen projector.

At 240 square feet, you need 12,000 lumens to fill it with the same brightness.

So, I'm not sure what your budget is, but I would not consider this an average or typical installation in any manner whatsoever.

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No, it's not a typical installation. According to your lumens requirements and our actual widescreen possible area of projection, we need about 6800 lumens. We're trying to make use of a physical space that could serve as a small cinema, but which also serves diverse other uses, classroom included. Therefore we cannot eliminate the smaller projection used by most for classroom and presentation purposes. In testing though, with the same projector moved 15' further away from the screen wall, we achieved a rather pleasing and encouraging projection. That was with 4000 lumens. I was trying to determine if I could find a single projector that would serve both purposes, but I'm pretty sure I'll be better off with two separate projectors. I don't have much for funds, so I'm going with content over form here. Any suggestions for a projector with 6500-7000 lumens?
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Right now I would take a look at the www.necdisplay.com website under refurbished projectors and use the code DECEMBER20 to take another 20 percent off.

There are some bright models on there with a fair price tag.
AV Integrated - Theater, whole house audio, and technology consultation during the build and installation process in the Washington, DC metropolitan area.