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Vidikron Vision Model 90t and Model 100t Owner’s Operating Manual 19
Vertical Lens Shift: The Vision 90t/100t zoom lenses (options 1, 2, 3, 4 and 6 in Table 3-3)
provide up to 80% of downward vertical lens shift. For example, with a 96 x 54-inch (16:9)
screen, you can shift the image up to 43.20 inches (1.10
meters) below the screen center.
(Upward vertical lens shift is not possible. Vertical lens shift is not possible in either direction
with lens option 5.)
Horizontal Lens Shift: The Vision 90t/100t zoom lenses (options 1, 2, 3, 4 and 6 in Table 3-3)
allow up to 10% of horizontal lens shift in either direction (left or right). For example, with a
96 x 54-inch (16:9) screen, you can shift the image up to 9.60 inches (24.38 cm) left or right of
the screen center. (Horizontal lens shift is not possible with lens option 5.)
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
Other ConsiderationsOther considerations and tips that can help improve your installation:
• Keep the ambient temperature constant and below 35°C (95°F). Keep the projector away
from heating and/or air conditioning vents. Changes in temperature may cause drifts in
the projector circuitry, which may affect performance.
• Keep the projector away from devices that radiate electromagnetic energy such as motors
and transformers. Common sources of these include slide projectors, speakers, power
amplifiers and elevators.
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.
Note