Keystone Correction

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If I choose to tilt the screen I am projectiong onto will this correct for focus issue as well?

How much of a tilt are we talking about at say 9 foot throw with 15 inch diagnol lcd and 330mm standard triplet?

Does this mean I can have the projector low and tilting up say 25 degrees or is that too much? What what I want is to put the projector low enough as to not interfere with viewing. What height should the lens be at in this design?
 
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