Screen Size; Ambient Lighting; Ventilation; Other Considerations - Christie Mirage M Series User Manual

• Optical—Optical screens take light from the projector and redirects it to increase the light
intensity at the front of the screen and reduce 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 appropriate for your lens and application. If the projector is 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 is 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 (3
m) high screen, the width of the screen must be at least 13.3 feet (4 m).

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 is reduced if stray light directly strikes the screen.
For example, when a shaft of light from a window or floodlight falls on the image, the image 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, allow free air exchange to the projector
with a minimum clearance of 25 cm (10 inch) on the left, right and rear sides of the projector from
any walls or other obstructions. Never obstruct the air exchange to the projector.

Other considerations

Other considerations and tips to improve your installation:
• Keep the ambient temperature constant and below 40
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, for example.
• 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.
Mirage M Series User Manual
020-101942-02 Rev. 1 (10-2018)
http://www.pureglare.com.au
Installation and Setup
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