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Vidikron Vision Model 90 Owner’s Operating Manual 3-7
Vertical and Horizontal Lens
Shift
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.
Figure 3-4. Vertical Lens Shift
Figure 3-5. Horizontal Lens Shift
These are general examples of lens shift. Lenses vary in their shift
capabilities. No particular lenses were 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)