Projector Position And Mounting - Christie J Series User Manual

Section 2: Installation and Setup
Screen Size
Select a screen size appropriate for your lens and application. If the projector will be used to display text
information, the image size must allow the audience to recognize all text clearly. The eye sees a letter clearly if
eye-to-text distance is less than 150 times the height of the letter. Small text located too far from the eye will be
illegible at a distance no matter how sharply and clearly it is displayed.
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).
Ambient Lighting
The high brightness of this projector is well suited for locations where ambient lighting might be considered
less than ideal. A typical room with ceiling lights and windows rarely requires special attention. Contrast ratio
in your images will be reduced if stray light directly strikes the screen. For example, when a shaft of light from
a window or floodlight falls on the image. Images may appear washed out and less vibrant. Avoid or eliminate
stray light sources directed at the screen.
Ventilation
The projector vents and louvers provide ventilation, both for intake and exhaust. Never block or cover these
openings. Do not install the projector near a radiator or heat register, or within an enclosure. To ensure
adequate airflow around the projector, refer to
requirements. NOTE:
Other Considerations
Other considerations and tips to improve your installation:
• Keep the ambient temperature constant and below 40°C (104F). 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,
slide projectors, speakers, power amplifiers, elevators, etc.
• 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. As a rule, be no closer than 1.5 times the width of the screen.

2.2.3 Projector Position and Mounting

Throw Distance
Throw distance is the distance measured from the front feet of the projector to the screen. This calculation
determines if there is enough room to install your projector with a desired screen size and if the image will be
of the right size for your screen.
To estimate the throw distance, take the horizontal width of the screen and multiply it by the lens throw ratio.
The result determines approximately the distance the projector should be positioned from the screen to project
a focused image large enough to fill the screen. For example, using a 0.73:1 lens, throw distance would roughly
be 0.73 x screen width.
2-10
Do not obstruct the air exchange to the projector.
Figure 2-6 make sure its installation meets the proper spacing
J Series 1000W and 1200W User Manual
020-100706-02 Rev. 1 (03-2014)