Projector Position And Mounting; Ambient Lighting; Other Considerations - Christie roadie 25k User Manual

INSTALLATION AND SETUP

Ambient Lighting

Other Considerations

2.3 Projector
Position and
Mounting
Throw Distance
2-10
Roadie 25K User's Manual
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The extraordinary brilliance of this projector is certainly well suited for locations
where ambient lighting might be considered less than ideal for projection. Even a
typical room or large auditorium fully lit with ceiling lights and windows rarely
requires special attention. Contrast ratio in your images will be noticeably reduced
only if light directly strikes the screen, such as when a shaft of light from a window
or floodlight falls on the image. Images may then appear washed out and less vibrant.
In general, avoid or eliminate light sources directed at the screen.
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Other considerations and tips which can help improve your installation:
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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 which radiate electromagnetic energy such
as motors and transformers. Common sources of these include slide projectors,
speakers, power amplifiers, elevators, etc.
•
Choose the best screen size for the application. Since more magnification reduces
brightness, use a screen size appropriate for the venue but not larger than
required. Installing a large screen in a small room is similar to watching
television at a close range; too large a screen can overpower a room and interfere
with the overall effect. A good rule of thumb is to be no closer than 1.5 times the
width of the screen.
Installation type, the available screen, and ambient lighting all affect where the
projector should be positioned. In addition, both throw distance (the distance between
the projector and screen) and vertical position (the height of the projector in relation
to the screen) must be determined for every new installation. Both depend on the
screen size and lens type you are using. Make sure that the room can accommodate
the required location of the projector for the chosen screen size.
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Throw distance is the distance between the projector and the screen (Figure 2.11).
For any installation, placing the projector at an accurate throw distance is necessary
in order for the image size to closely match your screen – the farther the projector is
from the screen, the larger the image. With zoom lenses, you'll want to know the
approximate minimum and maximum image sizes possible from a given throw
distance so that the most appropriate lens is installed at the site (throw distance /
screen width = throw ratio).