Hey All It's a toss up whether or not this could be located here or in display devices... Working on the layout and details of my pending HT construction and have run into a snag with projector positioning. I am considering the Sharp XV-Z10000U projector (with a 96" wide 16:9 Stewart FireHawk screen). The predominant recommendation for projector placement (on the vertical plane) is to have the center of the lens line up with the top of the screen (I am ceiling mounting). The screen will be placed such that my eyes are lined up 1/3rd from the bottom, which places the top of the screen (and hence the center of the projector lens) at 19" from my 8' ceiling. Not happy with the way that will look hanging out into space - be it an 8' or 80' ceiling it's going to be constrained by the screen position. Here's where I'm confused. The Sharp includes an optical lens shift, which if I understand correctly allows you to compensate for vertical positioning up to one screen height with the projector placed anywhere between the top and bottom of the screen without having to employ digital keystone correction. What precisely is the benefit of this feature? I would imagine the goal of a lens shift would be to allow you to place the projector higher than the top edge of the screen (for ceiling mount) and then shift the image properly onto the screen plane - thereby keeping the projector up and out of the way. Given that you are able to shift the image down while lined up with the top of the screen, why can you not have the projector elevated above and shift to the "normal" position? You would obviously not be able to cover the same range on the screen, but what value is there is moving the whole image below center anyway? What experience has everyone here had in their projector installations?