Originally Posted by pottscb
So, in reading Millerwill's multiple posts it seems like the further you site back from the HCHP, the less light drop off from the corners (no doubt due to the smaller angle involved with moving away, perpendicular, from the screen). My question is, what light percentage drop off is usually perceptible by most people. I know this is a general question, as there are people on AVS that claim to see a gnats ear at 100 feet. But I've read professional reviews that A-B'd pj's that had >20% light difference in side by side viewing and they state that it is hardly perceptible. My main question is, when using FLyboy's gain calculator, is .1-.2 gain dropoff acceptable when using from on access to the furthest viewing position (extreme edge of an 8 ft. long couch). I'm about 14 ft. away from my screen position, I was thinking a 106" but I want to know how if I should go smaller in order to decrease the unevenness in the corners of the screen. (and also whether to go with HCHP or re. HP fabric).
Thanks for any insight.
I'm not nearly as knowledgeable and experienced as most people in this game, so I think when I see something it has to be pretty blatant!
I think the reason that I saw this problem (brightness variation, esp darkening at the extremities of the screen) with the HC HP material is because I was going to a considerably larger screen, 144"W compared to my original 110"W (HP2.8 material) screen, and still sitting very close, ~ 12.5 ft, i.e., just over 1 SW. So I had to put my pj (RS20) further back behind my our 2 recliners: for the older, smaller screen the pj was only a ft or so behind our heads, but with the new larger one it was ~ 4 to 5 ft behind our heads (but still as low as possible for the pic to clear our heads). So the relevant angles for the retro-reflective character of the screen varied considerably more for various points on the screen than when it was much closer to our eyes (by being just behind our heads). So the much narrower viewing angle of the HC HP material reared its head.
BTW, I am incredibly pleased and impressed with the new HP 2.4 (non-HC version). The pic is so wonderfully smooth and precise, even more so than the older 2.8 HP, which was already outstanding in the regard.
While at CEDIA the last few days, just for the fun of it I walked by the Dalite booth to tell them how much I liked my new screen, and they said the the new HP2.4 material had borrowed aspects of their JPK Affinity screen, the super smooth material that Joe Kane helped developed esp for high res HD projectors.
The morale is that it really pays to get samples from Dalite to check all this out for your own specific situation!