Installation
Vertical and Horizontal | ➤ | Proper placement of the projector relative to the screen will yield a rectangular, |
Position |
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| Ideally, the projector should be positioned perpendicular to the screen and in such a way |
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| that the lens center is aligned with either the top or bottom edge of the screen area, and |
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| centered horizontally. See Figure |
Ceiling Installation
| Ceiling |
Height | Projection Distance |
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x |
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Lens Center
Lens Center
Screen
Floor Installation
Height
Lens Center |
x |
Screen
Lens Center
Projection Distance
Floor
| Figure | ||||||||||||||
Vertical and Horizontal ➤ | If it is not possible to align the projector and screen as shown in Figure | ||||||||||||||
Lens Shift | 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 | ||||||||||||||
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| 0% |
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| 50% Height | ||||
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| Lens Shift | ||||
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| (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 3-4. Vertical Lens Shift (Example Only)
22 | Runco |