Runco SC-1 - page 34

Installation
22 Runco SC-1 Owner’s Operating Manual
PRELIMINARY
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 and screen center are aligned with each other, as shown in Figure 3-2.
Figure 3-2. Projector Placement
Vertical and Horizontal
Lens Shift
If it is not possible to align the projector and screen as shown in Figure 3-2, you can use
the mechanical lens shift controls 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
Floor
Lens Center
Projection Distance
Lens Center
x
➤
50% OFFSET
50% Offset
0% Offset
Note: This is a general example of lens shift. Projectors vary in their shift capabilities. No
particular lens or projector is shown in this example.