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Vidikron Vision Model 120 Installation/Operation Manual 21
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Table 3-4 lists the lens shift limits for each available Vision 120 lens, as percentages and
absolute measurements with a 100 x 56 inch (1.78:1) screen.
Folded OpticsIn rear screen applications where space behind the projector is limited, a mirror may be used
to fold the optical path, as shown in
Figure 3-5. The position of the projector and mirror must
be accurately set. If you are considering this type of installation, contact your dealer for
assistance.
Figure 3-5. Folded Optics
Table 3-4. Vision 120 Vertical and Horizontal Lens Shift Limits
Lens Option
A1 A2 B C D E
Lens Shift Limits, as Percentages of Screen Height or Width (Notes 1 and 2)
Vertical
(Note 2)
Up 10% 31% 30% 32% 28% 30%
Down 10% 71% 61% 62% 65% 63%
Horizontal
(Note 2)
Left 5% 17% 12%
Right 5% 17% 12%
Lens Shift Limits in Inches, with a 100-by-56 inch (1.78:1) Screen
Vertical
Up 5.60 17.36 16.80 17.92 15.68 16.80
Down 5.60 39.76 34.16 34.72 36.40 35.28
Horizontal
Left 5.00 17.00 12.00
Right 5.00 17.00 12.00
Notes:
1. With no vertical or horizontal lens shift, the lens center and screen center are aligned with each other.
2. Vertical shift limits are percentages of the screen height. Horizontal shift limits are percentages of the
screen width.
3. Vertical lens shift figures apply to ceiling mount configurations. For floor installations (where the
projector is upright), reverse the up/down vertical offset percentages.
Screen
Mirror