Wolf DCX-1000I - Manual (Page 10)

Wolf Cinema Owner's Manual 2-4
Rear screen installations
There are two basic types of rear screens: diffused and optical.
a diffused screen has a surface, which spreads the light striking it. Purely diffused screens have
a gain of less than one. The main advantage of the diffused screen is its wide viewing angle,
similar to that of a flat screen for front screen projection. This type of screen is suitable when a
wide viewing angle is required but there is low ambient room lighting.
Optical screens take light from the projector and redirect it to increase the light intensity at the
front of the screen. This reduces it in other areas. a viewing cone, similar to that of a curved front
screen installation is created. This type of screen is better suited for brightly lit rooms where the
audience is situated within the viewing cone.
Screen size
Choose a screen size, which is appropriate for your lens and application. The size of the room
and viewing distance are the defining factors; a rule of thumb is that the primary viewing distance
be 1.5 x screen width.
To fill a screen with an image, the aspect ratio of the screen should be equal to the aspect ratio
of the image (expressed as the ratio of its width to its height). Standard video from a VCr has
a 4:3 or 1.33:1 aspect ratio. For example, to display a VCr output with a 4:3 aspect ratio onto a
10-foot (3m) high screen, the width of the screen must be at least 13.3 feet (4m).
Section 2 ► Installation and Setup
Ambient Light >
Other Considerations >
The high brightness of this projector is well suited for locations where ambient lighting might be
considered less than ideal for projection. a typical room with ceiling lights and windows rarely
requires special attention. Contrast ratio in your images will be noticeably reduced 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.
Other 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,
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 or a 23° viewing angle.