Display Devices Lifts up up 400 lbs - Manual (Page 4)

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Lift Placement and Location
Many projector lenses are not centered on the chassis of the projector. Ensure that the
centerline of the lens is aligned perpendicular to the center of the screen. Position the
lift offset the same distance as the offset of the projector lens. If your projector has
horizontal lens shift this is not as critical. We recommend offsetting the lift for optimum
projector alignment.
Projection Distance
If using a fixed focal length lens -- the screen-to-lens distance is critical. Offset the lift
position to compensate for the lens-to-lift difference. See your specific projector
manual for detail.
Fixed lens: measure distance lens-to-screen not
lift-to-screen
Lens Offset