Sorry to bother you again.
This time it's about screen.
I'm reading your screen build several times top to bottom but still I can't understand some of the things you described. The masking system is really difficult for me to grab.
Here's a couple of questions to start with.I'm asking these question in your thread because I'm very interested knowing the reasoning behind your decisions.
1.Before asking about masking system, you said you are using an HD-6000R A-Lens with the projector.
Can't we set the projector to fill the 2.35:1 image on the screen without an A-Lens ? Does the projector of 16:9 native A/R project black bars top/bottom when 2.35:1 material being viewed (Diagram 1) or does it fill the 16:9 screen area (Diagram 2)? (Please see attached picture). I think it should be diagram 1. So if we just zoom in the lens or move the projector away from the screen won't it fill the 2.35 screen as in Diagram 3? (The letter box bars will be overshoot on to the wall).
2. And if the diagram 1 is the picture projector will give you, you have to use the vertical strech function before using an A-Lens?
3.And I think blu ray movies comes in several formats such as 2:4.1,2.35:1 or 1.85:1. Since the projector gives you a picture of 16:9, you use A-Lens for all the formats? Or you use the A-Lens only when viewing 2.4:1 material?
4.Isn't it correct the choosing a 4:3 screen of 130" wide (with horizontol masking) over a 2.40:1 screen of 130" wide (with vertical masking) will give you the maximum utilization of your screen wall?(the 2.35 format actually turns out to be the smallest screen you can install from a total square footage perspective.http://www.projectorcentral.com/235_home_theater.htm
If so why you decided on 2.40:1?
I have some more questions specific to your build, will ask them in another post.