I've never bothered having a projector calibrated professionally before but with the Sony 760 it feels it would be rude not to. I also saw an uncalibrated HD projector recently which had utterly off colours which the guy thought was nonsense "because it came like that out the box and they know what they're doing", which makes me wonder how much my own image may change when calibrated! One problem I have though is I'm projecting on a white wall (completely normal dulux) and haven't gotten anywhere choosing a screen. I have never used them and haven't a clue about brand/surface. It's also complex as the way my wife likes the screen the top of the image (of 16:9) is about 5 inches from the top of the ceiling (if that) and so I doubt a pull down with black borders would fit. I don't think we can move the image down as we've getting a cabinet to cover up part of the wall which means the centre speaker will be pretty much just below where the image projects... so maybe we'll get a fixed screen... but then the Mrs thinks we may as well projector on the wall, and she has a point. So though I have various issues (like what on earth screen to go for, the width of the projected image is about 270cm by the way, we assume we'll need a 16:9 screen as the Mrs likes her image BIG) the question I had in my mind was... Is it a waste of time getting a projector calibrated when you haven't installed a screen yet, given the screen being installed will change at the absolute minimum the focusing but presumably it may effect other settings too?