This could be a very basic question: should I consider center of screen or center of projector lense as a reference point when I calculate off center angle for HP screen? I have a situation when I use optical shift in horizontal direction so the center of screen is few ft on the left from the center of the projector lense. In such case is it still better being closer to the projector or it is better being close to the line going to the geometrical center of the screen?
Better to be close to the projector. The retro-reflective character of the HP sends the most light right back where it came from, i.e., the projector, for each point on the screen.