Join Date: Apr 2000
Location: Ottawa, Ontario, Canada
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As Don Stewart said in his post, "commercial movie theater runs at about 12 to 13 foot lamberts". That is a good starting point for a dark room where you have almost total light control. Your light blocking shades will definitely help a lot, at 30 ft. lamberts you've got a REALLY bright image. That's regular tube TV bright! You could conceivably watch it in daylight (although your black level would suffer for it...). Your problem may be that it is TOO bright when you close off ambient light, I had that problem with my current RPTV before calibration. Bright scenes were literally painful to my dark-adapted eyes.
You might consider a 16*9 screen of the same height, you G11 should be able to handle it easily. Even without an anamorphic lens, you could get as much as 16 ft. lamberts out of the G11. With an anamorphic lens you could get more than 20 ft. lamberts even with the loss of brightness from an added optical element.
At 30 ft. lamberts, your black level will also be rather...un-black. If you get your projector calibrated (to gain some additional contrast) and throw a black border around your screen this may not be noticeable. A gray screen will also help by making your "blacks" darker, this will similarly lower your white level as well (but you have plenty of that...). I would also think that using a gray high gain screen would be counter-productive, the two would work against each other and you would also get hotspotting!
Hope this helps!