If you’re mounting the projector on the ceiling and you place it above screen level, you’ll have to tilt the projector down to position the image on the screen. This causes the image to lose its square shape. You can correct the distortion using the Keystone function in the projector’s menu system (see page 120).
If you place the projector so that the base of the lens is level with the bottom of the screen, the image should be square and you won’t have to adjust it. If you place the lens lower than the bottom of the screen, you’ll have to tilt the projector upward if you want to fill the whole screen with the image.
176Projector Installation