How high should I mount my projector?

I have an Optoma HD66 projector and I do not know how high to mount the projector. The projector can be up to 11' from the screen. I have 70" wide screen to work with. I do not want the screen to high but I don't want the projector too low either.

Here are the specs of the projector.

http://www.optomausa.com/Product_detail.asp?product_id=459
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varesourcesAsked:
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GuruChiuCommented:
I typically will mount the projector upside down, with the bottom of the projector level with the top of the screen. There are other considerations,

any obstacles in between
If you have very high ceiling, you do not want the mounting pole too long
You will need some way to secure the mounting pole
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varesourcesAuthor Commented:
The mount I have it about 6" tall. I am wanting the screen to start about 18" below the bottom of the projector. Is this going to be possible? There are no obstacles.
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GuruChiuCommented:
Yes, it is possible. Many mount allow you to tilt to aim the projector to the screen. The reason I prefer the bottom of the projector level w/ the top of the screen is to minimize distrotion. If you tilt it, the width on the bottom of the screen will be wider than the top of the screen.

Many newer projector allow you to adjust for this distrotion, although adjustment like that usually bring slight degrade of graphic quality.
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varesourcesAuthor Commented:
It may be better to put the projector on a shelf on the back wall. I do not want to lose image quality at all. Would the keystone fix the width problem?
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GuruChiuCommented:
Keystone is the adjustment I mentioned. It fix the problem but introduce slight loss of quality. It is barely noticable. The problem of mounting on the back wall is most projectors come with a lens that is best within 20' of the screen. Most time the back wall is too far away but in your situation it may be different.
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