Runco VX-55D, VX-44D manual Ceiling Installation, Floor Installation, 2. Projector Placement

	Installation
Proper placement of the projector relative to the screen will yield a rectangular,	Vertical and Horizontal
perfectly-centered image that completely fills the screen.	Position

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.

Ceiling Installation

Ceiling

Height

Projection Distance

Lens Center

x

	Screen	Lens Center
Floor Installation
Height	Screen	Lens Center
Lens Center
x
	Projection Distance
		Floor
Figure 3-2. Projector Placement
If it is not possible to align the projector and screen as shown in Figure 3-2,you can use			Vertical and Horizontal
the lens shift controls to center the image on the screen. Lens shift is generally expressed			Lens Shift
as a percentage of the screen height or width, as shown in Figure 3-3and Figure 3-4.

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 of lens shift. Lenses vary in their shift capabilities. No particular lens or projector is used in this example.

Figure 3-3. Vertical Lens Shift (EXAMPLE ONLY)

Runco VX-44d/-55d Owner’s Operating Manual 21