I have today ordered my first pj (benq 5120), and I am a complete novice. I have a through lounge and intend to put the pull up/down screen up in the middle of the room (just hanging in free space from the ceiling). Is this recommended, as it appears that screens are usually put against a wall? I should add that I was only planning to buy a cheapo screen probably from ebay. I am planning to put the projector on a shelf above the window (about 7' high) facing the hanging screen 12' away. My question is; To achieve a quality screen image of about 6', is it better to have the projector closer than 12' away. I have this theory that the further away a projector is from the screen the poorer the picture quality (this is probably a bad theory)? Any views/opinions will be appreciated?