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18 Vidikron Vision Model 90t and Model 100t Owner’s Operating Manual
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
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)
Figure 3-4. Horizontal Lens Shift (Example Only)
➤
These are general examples of lens shift. Lenses vary in their shift
capabilities. No particular lens or projector is used in these
examples.
Note
Base plate to center of lens
Approx. 5-6" (depends on the
amount of lens shift)
50% Height
Lens Shift
(0.5 x H)
100% Height
Lens Shift
(1.0 x H)
150% Height
Lens Shift
(1.5 x H)
Screen Center
0%
0%
Screen Center
100% Width Lens Shift
(1.0 x W)
50% Width Lens Shift
(0.5 x W)
150% Width Lens Shift
(1.5 x W)
Screen Width (W)