are the lenses of the projectors designed in some way to account for the variation in distance from the top to the bottom of the screen? i am wondering if i should slightly angle my screen wall so that it is "leaning back". it might actually solve another problem i have where i could use a couple more inches at the top but i wonder if it would help focus or hurt it.

http://battas.zftp.com/dropbox/avs/leaning%20screen.jpg

greg

Projectors are designed to shoot Level with a level screen it is not a good thing to have to tip a projector you then must use Keystoning to correct the distortion. Tipping the screen would be a bad thing. Either of those would be a no other choice solution, when ever possible both should be plumb.

It depends on the projector. There is a reason why many people buy projectors with lens shift.

One reason to tip the screen would be to prevent having to use keystone correction. For example, due to the offset requirements of the projector in my family room, the projector would only be slightly higher than "head-height", which could be a safety issue for taller people. This was at the extent of the lens shift. I resolved this by raising the projector a few inches, and tilting it down. To compensate for tilting the projector, I tilted the bottom of the screen up a bit. I have a shadow box for the screen, so it looks fine. I could have resolved this via keystone correction, but didn't want to alter the image if at all possible.

Every situation is different, and you need to figure out what works best for you. But, as McCall stated, if the projector is level, you should not tilt the screen.

Tom