Looks like I've fallen foul to some misinformation from the projectorcentral calculator for the Z1. Its giving different results to the calculator on the sanyo website, which I'm guessing is more likely to be correct. I was all ready to order but my lens throw measurements are now out by about 6" which is kinda awkward. I can get around it, I think, but a PJ with a longer throw is the better solution for keeping the lounge looking wife friendly. The Sony HS10 fits the bill in that respect but is it worth the extra dosh or am I better off working around the positioning problem of the Z1.