Originally Posted by amb1s1
So how big can I go with a cinemascope or 16:9? What projector with lens memory will fill a 140" cinemascope?
Here is a formula that you can use:
Achieve at least 16 foot lamberts brightness in calibrated, 'Cinema' mode assuming you have a completely light controlled room (higher brightness if this is not the case). This is calculated as 'lumens/screen area (sq. ft.) x screen gain. You will need to find what the calibrated brightness of the projector is in lumens. For the Panny, 'The PT-AE8000 measured 602 lumens calibrated in "best" mode' according to ProjectorReviews.com
So, your maximum screen size will be: 602/16 x 1.2 (assuming the highest gain screen possible) = 45.2 sq. ft. or a 122" diagonal (16:9)
If you use an anamorphic lens for a 2.37 screen, you will get away with a 124" width by 52.3" high (134.6" diagonal) (This factors a 10% brightness loss due to the lens, although good lenses lose much less light).
You may also factor in bulb dimming over time, so your screen sizes will be even smaller.