First off, I have been on this site for the last six months, and have learned so much. I am about 75% done with my theater. It is 21x28x10 feet,with three rows of seating, which will be for movies, gaming, and a little cable t.v. My projector will be the panny 700 with 106" homemade screen out of blackout cloth, in a 100% controlled lighting. First question- Is there a change in picture quality when the zoom is used? The projector placement is very flexible, but I do not know if I should use the 2x, 1.5x, or 1x zoom? Which is best, or does it not make a difference in picture quality? Second question- I can ceiling mount or floor mount the projector. How far down from the ceiling or up from the floor does the projector have to be in reference with the screen(if that makes any sense to anyone)? I apologize if these are stupid questions, but I can not find the answers anywhere. Any help or input would be greatly appreciated.