Vertical and Horizontal Position
Proper placement of the projector relative to the screen will yield a rectangular, perfectly-centered image that com-
pletely 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.
Table Installation
Height
Projection
Distance
x
Lens
Center
Screen
Lens
Center
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.
Screen
Center
0%
50% Height
Lens Shift
(0.5 x H)
100% Height
Lens Shift
(1.0 x H)
Note
This!is!a!general!example!o f!lens!shift.!Lenses!vary!in!their!shift!capabi lities.!No!particular!lens!or!
projector!is!used!in!this!example.!
!
Figure 3-4: Vertical Lens Shift (Example Only)
Vertical Lens Shift:
The projector provides up to 120% of upward vertical lens shift and up to 120% of downward vertical lens shift. For ex-
ample, with a 100 x 56 inch (1.78:1) screen, you can shift the image up to 14.00 inches (0.36 meters) above or 33.60
inches (0.85 meters) below the screen center.
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