Since I will be installing this unit in a room with a cathedral ceiling, the mounting distance is pretty fixed. It has to be between 19' and 20' away from the screen. I used the throw calculator at ProjectorCentral. Typing in 20' gave me a 147" screen! Argh! At most, I can do a 9' (108") screen, 8.5' (102") would probably be the biggest tensioned pull-down screen I could do.

The PDF on this product claims a projection angle of 17 degrees. I don't know exactly what that means, but I think that it means the bottom of the picture shoots directly straight out of the lens and the top of the picture shoots up at a 17deg angle from the lens.

Going back to high-school trig, we can figure out the height of the image at a 20' distance by multiplying that distance by the sine of 17 degrees. That gives us 70". Now, the NEC is XGA, meaning 1024x768, or an aspect ratio of 4:3. Applying this aspect ratio to the height, I get 93.5". This is *QUITE* a bit different than the 147" claimed by the calculator and well within my requirements.

So, who is right? How is this calculation supposed to be made? Backcalculating the ProjectorCentral number of 147", I would get a projection angle of over 27 degrees.

Anyone who owns one of these... could you please post the distance to the screen you are using and the resulting height and width of the image?

If it doesn't look like the LT150 will work at 20' out of the box, are there any fixes I could apply to the lenses to make it work?

Thanks for any help!

-todd-