I have build a projector in HAAS-style, and I am going to mount it in the cieling, but I currently have it on the floor.
The picture is very good when I have the projector pointing straight forward, but when I tilt it and try to move the front fresnel for keystoning, the picture get very blury at the point there the fresnel is far away from the LCD-panel.

Is there anyone who know what the problem may be?