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Point 1 in your consideration: Go to a common denominator:
1.33:1 - Television
1.37:1 - SMPTE/Academy Silent Full Aperature
1.66:1 - so-called 'European' wide-screen, also commonly used by Disney Animation
1.77:1 - HDTV aspect (also called 16:9)
1.85:1 - North American spherical wide-screen
2:1 - common shoe-box compromise screen aspect
2.35:1 - Commonly quoted, but often refers to 2.39:1 and 2.4:1 aspect, anamorphic wide-screen (aka Cinemascope.)
Those are the common formats floating around. Yes, you do occassionally get the odd-balls - the super-ultra-magna-MGM-Pana-Scopes(tm) with the 3.2:1 aspect ratios, or some of the really funky Russian 3-D formats that are pretty close to 1:1 (actually, I think they're .9:1 - narrower than they are tall, but I said they were funky.)
Anyway, back to the original point, there's a lot of stuff in the 1.66:1 - 1.85:1 range. How much would it hurt you to go to a minimum aspect of 1.85:1? I don't really know. Individually, the steps between 1.66 and 1.77, and then 1.77 to 1.85 are fairly small, but if you look at the difference between 1.66 and 1.85, well, now we're looking at real differences!
Another point is, often, projectors have a 4:3-shrink mode, that'll reduce the 4:3 area into something that'll fit (pillarboxed) into the 16:9 frame. Except with your 1.85:1 screen, it'd be artifically letterboxed on top of that, too.
In case you're wondering, I'm not really trying to be helpful - I don't know what helpful is in this case.
Leo
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