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post #3271 of 3271 Old 10-11-2016, 11:47 AM
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Originally Posted by vantage78 View Post
Hi Chris, thanks for the response! Some follow-up questions:

1) I'll definitely look into the Black 1.2. However, it seems to have a constraint of 2x the width of the screen for the minimum throw. For the size I am considering, 141" diagonal, a 2 x 130" W min throw would put me at 21.7'. I'm currently prewired for the projector to be mounted at 16.8'; I always thought if I move it back to 21' or so, I'd be losing image brightness?

2) How does vertical half-gain correspond to vertical viewing angle? Per my calculations with a 141" diagonal screen with a 54.8" high viewing area, I'm probably going to achieve a 16.15 degree vertical viewing angle for my first row, 8.52 degrees vertical viewing angle for my back row. Would a AV 1.3 or a AV 1.2 be ok considering those vertical viewing angles?

I appreciate the insight!
1) The 2x throw distance is recommended for uniformity. It's just a guideline that can be pushed. The eye is logarithmic in response, so it takes a surprisingly high amount of nonuniformity to create visible hotspotting. You may be losing some brightness by moving the projector back, but any ALR screen will benefit from a longer throw. So, I'd say do what you can (e.g. mount one stud back, or move it back if it's not that big a deal) but I wouldn't conduct major surgery to accommodate that recommendation.

The AV1.3 would exhibit better uniformity, but the AV1.2 is a smoother, less reflective look.

2) Our ALR materials are nondirectional, in that they have the same response vertically as horizontally. Your vertical angles are not an issue at all.


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