Originally Posted by CADOBHuK
The top screen edge placement is for better ansi contrast, since less light is reflected back from them the lens this way. But how large is the difference? At top edge placement the projector has over 700 ansi cr, but what does it have near the middle of the screen? If the difference is big enough I'll gp through the extra trouble to place it higher.
I think it is worth mentioning here that both the 8130 and the 8150 have the exact same range of vertical lens shift, despite what some of the specs say even from Planar. I have this from Brian:
"The vertical offset was going to be different between the two models, then we decided to make them the same. So they are the same.
I'm not sure what your screen width is, but I used a 92" wide 16:9 screen. The max offset (from center of the screen to the center of the lens) is 31.1". That would put the center of the lens 5.2" above the top of the image.
It can go lower than the top of the image by quite a bit (-12.9" below the center of the image).
If I'm not mistaken, with ceiling mounting, you can't get the lens all the way to the bottom of the screen, only the top. For table top mounting, the converse would be true . And the best contrast presumably therefore is only at one end of the screen not both, as the range of lenshift only encompasses one end of the screen. Correct me if I have this wrong Brian .