![](/images/new-backgrounds/1191567/19156761x1.webp)
| Installation |
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Proper placement of the projector relative to the screen will yield a rectangular, | Vertical and Horizontal |
Position | |
Ideally, the projector should be positioned perpendicular to the screen and in such a way |
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that the lens center and screen center are aligned with each other, as shown in Figure |
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Ceiling Installation
Ceiling
Height
Projection Distance
Lens Center
x
| Screen | Lens Center |
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Floor Installation |
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Height | Screen | Lens Center |
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Lens Center |
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x |
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| Projection Distance |
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| Floor |
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Figure |
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If it is not possible to align the projector and screen as shown in Figure | Vertical and Horizontal Lens | ||
lens shift controls to center the image on the screen. Lens shift is generally expressed as a | Shift | ||
percentage of the screen height or width, as shown in Figure |
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Screen Center
0%
50% Height
Lens Shift
(0.5 x H)
Base plate
to lens center =
approx.
on the amount of lens shift)
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)
Vidikron Vision Model 120 Owner’s Operating Manual | 19 |