Quick question. I know this is basic, but I've never used a UST projector and am truly a newbie to this world. I have had a dedicated theater room for years, but always with the PJ on the other end of the room. I have a fixed screen but it is an odd size, like 112" I believe. I keep reading people either going 100" or 120" for their screens. Are these necessary sizes due to some kind of limitation, or is it as simple as physically moving the projector further back until I can fill a 112" screen. Thanks.