Christie CP2000-X User Manual download pdf (Page 14)

INSTALLATION & SETUP

2-6 CP2000-X User Manual

020-100031-01 Rev. 1 (03-2009)

Figure 2.7. Audience Coverage with a Flat Screen

NOTE: CP2000-X high-contrast lenses are designed primarily for use with flat

screens, but the projector’s depth-of-field range allows the lens to be focused on

mildly curved screens as well. While focus remains sharp in the corners, there may

be significant pincushion distortion, primarily at the top of the screen.

Rear Screen Installations

There are two basic types of rear screens: diffused and optical. A diffused rear screen

has a surface that spreads the light striking it. Purely diffused screens have a gain of

less than 1. The main advantage of the diffused screen is its wide viewing angle,

similar to that of a flat screen for front screen projection. Optical rear 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, and creates a viewing cone similar to that of a

curved front screen installation.

To summarize, optical screens are better suited for brightly lit rooms where the

audience is situated within the viewing cone. Diffused screens may be better suited

when a wide viewing angle is required but there is low ambient room lighting.

Screen size (image size) may be up to 145 feet across, depending on your lens and

ambient light level. Choose a screen size appropriate for your lens and application.

Keep in mind that if the projector will be used to display much text information, the

image size must allow the audience to recognize all text clearly. The eye usually sees

a letter clearly if eye-to-text distance is less than 150 times the height of the letter. In

other words, small text that is simply located too far from the eye will be illegible no

matter how sharply and clearly it is displayed.

NOTE: Screens/images are most described according to their horizontal (

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)

screen width. Aspect ratio is also specified if it is anything other than 4:3 (see

below). The older “diagonal screen size” typically used for 4:3 displays such as

televisions and monitors is less commonly used for large projection screens.

Screen Size

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Christie CP2000-X User Manual Page 14