Biggy, you dont need to have the projector in the middle since you can adjust the lens. While they have an optical zoom as pointed above the, larger the screen size, the larger the distance you'll need. I have an Epson 3lcd and does wonders. I suggest to go for a mounted screen since even the most expensive ones you can roll down eventually are going to have "waves". I'm not very familiar with 3d projectors, but I assume they are pretty good
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