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Hi Dave;
This is the kind of stuff I do from time to time. I do big screen video projection for concerts outdoors.
First of all to get a 30 foot diag. screen that is 24 feet wide it would have to be like 18 feet tall. Your projector throw would likely be around 30 or more feet, depending on the projector. I have a provision that will fill a 17.5 foot screen at 13.5 feet. So it depends a lot on the actual lenses. When we do the concerts we use 17.5 foot screens with lcd projectors and a 24 foot more or less throw.
The other concern is ambient light and that is more than you might expect outdoors. It will have to be really dark to get any kind of picture outdoors.
Another consideration is actual light output from the projector. My Provision is only about 800 lumens. Then reasons I can use it are short throw, rear projection which is brighter than front projection screen, and it has to be really dark. Especially between the proj. and screen. For the larger concerts we use two systems. One on each side of the stage. They are front projection screens and we use a minimum of 10,000 lumen projectors. Even then it has to be after dusk to get a good picture. Of course this is in a stadium with a 15,000 plus audiance.
While you can have lots of fun with what you have you might want to scale down your screen size somewhat. I have used my crt projector and 10.5 X 14 rear projection screen by placing the proj. in the garage and setting the screen up just outside the door. This way the area behind the screen can be dark. This works great for like nightime football games. The neighbors just roll out the recliners and have fun.
Good luck with your project.
Bill R
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