Acer H9500BD - Manual (Page 26)

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How to get a preferred image position by adjusting
lens shift
The projector is equipped with lens shift for adjusting the position of projected
image right and left or up and down without requiring you to physically move
the projector.
Note: The figures shown in this section are for reference only not
approximate value. The figures between units can be different due to
assembly tolerance.
Vertical Lens
Shift ring
Horizontal
Lens Shift ring