Join Date: Apr 2000
Location: Ottawa, Ontario, Canada
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I'd have to say that DIY'ing a curved screen is risky if you don't understand the math behind how the TORUS works, you could easily end up with a screen that has too high of a gain for the curvature or vice-versa, or a vertical curvature that is optimized for a different gain than the horizontal. There is a reason why Sigma Design Group charges so much for their design fee (although I would argue that it's probably too much, they're used to larger projects I think). That's shouldn't discourage people from trying, but make sure you do your homework first! In any case it shouldn't look too bad no matter what you do, but it probably won't come close to a truly optimized TORUS. Just remember, a curved screen only provides a benefit if you use a moderate to high gain surface (even if it has a grey backing).
You won't be disappointed with either of those projectors, they really are amazing! I only wish they weren't $10-15k outside of my budget!
Anyways, if you only want to curve in one direction (I would recommend a horizontal curve) you don't need to go the DIY route. I know Stewart can curve one of their fixed screens in one dimension and you can get microperf as well! Actually, many modern theatres go this route (although I've heard the curve is to improve focus on their short-throw lenses). You could take the gain up to 2.0 - 2.5 (that's just a guess, I don't know what the gain characteristics are for screen surfaces with such a high gain) and go for that 10' screen! It should give you somewhere in the neighborhood of 8 ft-lamberts with minimal hotspotting.