Peter
Further to my email this morning - this can't be done with your current setup.
2 projectors, as you suggested, is just complicating an already difficult setup - Think simple!
A mirror positioned in the correct position might be your best solution. Golden rule to remember when working with mirrors is 'angle on = angle off' but you cant do this with 1 projector.
Even if using a mirror - with the dimensions on your drawings, there would be no space to rig the projector to get enough distance to cover the whole screen - and you would still encounter some of the same focusing issues as previously discussed.
The screen dimensions of 10m x 6m is impossible to cover with any single projector at a distance of 3m - there is no lens that exists that could cover the whole area.
Check out the barco lens tool to try and work out your minimum distance! Using a 0.8:1 lens on your 10x6m screen, the projector has to be 12m away - and thats straight on. http://www.barco.com/presentation/en...calculator.asp
You may be able to cover the screen with 2 x projectors at about 6m - but you would still need to overlap and blend them. - This still doesn't take in to account your steep angle, focus and brightness between top and bottom.
I suggest that you try and look at getting a greater distance between the projector and screen, preferably with a less steep angle
Alternatively - use an LED screen!
Simon