Join Date: Jul 2001
Location: Rohnert Park, CA
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I chose to go with a roughly 2.0:1 AR screen (132" wide). Some people call it CIA (constant image area). Scope movies take up the entire width (small amount of masking on the top and bottom). 16:9 movies take up the entire height (small amount of masking on the sides).
The black bars are quite small. I have a few plans for some type of automatic masking - but have other projects to finish first.
I've read others on the forum who employ replaceable masking strips (attached with velcro or similar) and just put them in place. Some others have built elaborate 4-way masking systems DIY - but this is not for the faint of heart. Yet others simply zoom over a bit and use their projector's internal masking to crop off the edges - and watch everything in the 2.0:1 AR. Purists, of course, argue against this.
What I like about CIA, is that neither AR is "bigger". Scope movies are w-i-d-e-r and 16:9 movies are, well, 16:9. Both are impressive in their own way, and both are immersive. My JVC RS-55 fills the screen in my completely light controlled, dark room, and I find it bright enough running all AR's.
I hope this helps with your decision.