This projector is very sensitive to mounting. Measure very carefully. The center of the lens does not line up directly with the top of the screen if ceiling mounted. You must add a 1.98" keystone factor. So from the top of your screen which is the white part of the screen, measure down 1.98" and then line up the center of the projector lens to this point. Check your manual to confirm the 1.98" dimension for this model but I recall this to be it.
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