AVS Forum Addicted Member
Join Date: Dec 2000
Location: Venice, Florida, USA
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Nothing is perfect because a screen is merely a reflector of light.
Ideally, with room surfaces far away from the screen and say a 14 ft wide 2.35, a unity gain screen such as the Stewart Snowmatt would be ideal assuming what ft lamberts you get is enough for you. With 1900 Lumens, that would give you 23 ft lamberts. Enough Too much? What if you want 40 ft lamberts or 60 ft lamberts or is the current room standard what you want to emulate. Hell no! Turn them F speakers up. Whatever you want but with a 1.0 you might need a different projector than the Lumis.
What about the reference black level? Maybe a gain of less than one might be right for you. Say a 0.9 like the Da-lite Affinity might be right. Colors can be made perfect, people who say no negative gain screen will handle colors correctly are just plain wrong. The color man himself, Joe Kane uses a negative gain screen for his traveling show 54 x 96 and his Samsung. Remeber all this DLP machine have a relatively low natve on\\off and a relatively high ref blk level. But with a big screen llike our example, you should be fine at 1.0
A reflector. Reflects. Ideally uniformally. Buy duh. Your walls will usually be rather close (within a few feet, say less than 10) of the screen edge. With a unity gain screen reflecting perfectly the walls will light up. Hell everything lights up. We issue black flannel pajamas for guests in my HT. If pretty women are coming we descretely ask them to wear black under garments in case things get carried away. Don`t want reflections from anything to hit that screen.
OK. ou`ve got your lighht cannon reflecting everywhere and bouncing light back to the screen. Black Pit, far surfaces great. Don`t have it Maybe you want a more directional screen (read gain) or maybe you want a negative gain to cut down on the light. Of course there are other ways of cutting down on the light.
Rambling. You better have the right room before you go to a high quality unity gain screen. BTW I am going to switch from Studeotec 130 myself. Now that I have left the dark side (FP CRT) I have lumens to spare with almost any bulb projector and my 54 x 96. I am happy with 12 to 14 ft lamberts. I don`t want to ruin my ears (Huh?) and my room is a black pit. Now I willl probably go with a 0.9 because my scren is small there are projectors I test and watch for some time that need some black ref level help. For the Lumis alone, I would go with a 0.8.