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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 3-3.
Ceiling Installation
Height
Lens Center
x
Floor Installation
Height
Lens Center
x
Figure 3-3. Projector Placement
If it is not possible to align the projector and screen as shown in Figure 3-3, you can use
the 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 3-4 and Figure 3-5.
Vertical Lens Shift: The VX-2i provides up to 80% of downward vertical lens shift. For
example, with a 96 x 54-inch (16:9) screen, you can shift the image up to 43.20 inches
(1.10 meters) below the screen center. (Upward vertical lens shift is not possible.)
Horizontal Lens Shift: The VX-2i zoom lenses (Proteus B through F) allow up to 10% of
horizontal lens shift in either direction (left or right). For example, with a 96 x 54-inch (16:9)
screen, you can shift the image up to 9.60 inches (24.38 cm) left or right of the screen
center. (Horizontal lens shift is not possible with the Proteus A lens.)
1. With no vertical or horizontal lens shift, the lens center and
Note
2. Vertical shift limits are percentages of the screen height.
3. Vertical lens shift figures apply to ceiling mount
Runco VX-2i Owner's Operating Manual
Ceiling
Projection Distance
Screen
Lens Center
Screen
Lens Center
Projection Distance
Floor
screen center are aligned with each other.
Horizontal shift limits are percentages of the screen width.
configurations. For floor installations (where the projector is
upright), reverse the up/down vertical offset percentages.
17
Installation
Vertical and Horizontal
Position
Vertical and Horizontal
Lens Shift
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