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18 Planar PD8130/PD8150 Installation/Operation Manual
PREL
I
MINA
R
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 3-3.
Figure 3-3. Projector Placement
Vertical Lens Shift You can use the lens shift controls on the projector 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 3-4 and Figure 3-5.
Figure 3-4. Vertical Lens Shift (Example Only)
➤
Screen
Height
Projection Distance
Ceiling
x
Lens Center
Lens Center
Ceiling Installation
Screen
Height
Floor
Lens Center
Projection Distance
Floor Installation
Lens Center
x
➤
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.