ViewSonic LS850WU - Controllability of the Projected Image (LS850 WU;LS860 WU)

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Controllability of the Projected Image (LS850WU/LS860WU)
By using the lens shift knobs on the projector , you can adjust the vertical lens
shift by +/- 50% or horizontal lens shift by +/-23%, which offers the convenience
of not needing to physically move or interact with the projector. This is especially
important when the projector is mounted to the ceiling.