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So, for those of you who have ceiling mounted, how far down must the projector hang in order to avoid using keystone correction. The instructions say the center of the lens should be aligned with the center of the screen. The center of my intended screen is about 42" from the ceiling. Obviously, I can't have a 40" tube. So, I have to use keystone correction? How much degredation in picture quality can you expect? What possible installation scenario could you have that WOULDN'T require correction (ceiling mounted)? Thanks.