Hi there - I'm a pj noobie, but I mananged to get my HT510 ceiling mounted. I'm a little worried, though, that I may have not positioned it 'optimally', I'd appreciate any opinions, please? It's centred horizontally and the ceiling mount puts it vertically level with the top of the screen (which is 230cm by 130cm approx). The screen is a DIY MDF and light grey screen goo, in case that makes a diff 1) Should I position it where it needs to do least or most or middle zooming to get the screen size I like? What effect will zooming have on the quality? 2) Should I position it as low as possible (a ceiling mount 'extension') to get it near centre, or does this not have much effect given modern keystone abilities. 3) Should I put lens-shift at a middle position (I'm pretty sure I should, but thought I'd add the q) 4) Any other basic things I should take into account? Before I got the ceiling mount I had it absolutely centred horizontally and vertically and I don't think it looks 'as good' any more. Thanks lots for any advice, folks!