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Roy, you have misunderstood the keystone issue. This projector, like pretty much all DLP projectors, has a built-in upward throw angle, or vertical offset. It throws the picture entirely above the centerline of the lens if the projector is table mounted. If ceiling mounted, it will throw a properly formatted image downward. The only time you'd need keystone to square it up is if you tilt the projector at an angle to hit a screen, which you would likely have to do if you were projecting over the heads of the audience from a shelf behind the seats.