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20 VX-3000d Series Installation/Operation Manual
PRE
L
IMINAR
Y
Vertical and Horizontal
Position
Proper placement of the projector relative to the screen will yield a rectangular,
perfectly-centered image that completely fills the screen.
Ideally, the projector should be positioned perpendicular to the screen and in such a way
that the lens center is aligned with either the top or bottom edge of the screen area, and
centered horizontally. See
Figure 3-2.
Figure 3-2. Projector Placement
Vertical and Horizontal
Lens Shift
You can use the lens shift controls on the projector remote to center the image on the
screen. Lens shift is generally expressed as a percentage of the screen height or width, as
shown in
Figure 3-3 and Figure 3-4.
Figure 3-3. Vertical Lens Shift (Example Only)
➤
Screen
Height
Projection Distance
Ceiling
x
Lens CenterLens Center
Ceiling Installation
Screen
Height
Floor
Lens Center
Projection Distance
Floor Installation
Lens Center
x
➤
Base plate
to lens center =
approx. 5-6" (depending
on the amount of lens shift)
50% Height
Lens Shift
(0.5 x H)
100% Height
Lens Shift
(1.0 x H)
Screen Center
0%
Note: This is a general example of lens shift. Lenses vary in their shift capabilities. No particular
lens or projector is used in this example.