Christie CP2000-X User Manual page 17

Positioning at a
Port Window
Throw Distance
CP2000-X User Manual
020-100031-01 Rev . 1 (03-2009)
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.
With the projection head secured on a suitable cart, position the unit so that the front

bezel is less than 2 feet from the theatre's port window wall, or 3 feet if the optional
auxiliary lens mount will be added. Center the projector with the theatre screen ()
if possible (see Figure 2.10 A). If forced to be off-center (such as when a film
projector is already present), try to optimize aim as shown in Figure 2.10 B. This will
slightly increase side keystoning, but will minimize horizontal lens offset required.
NOTE: Unlike film projectors, it is best to keep the projector lens surface as parallel
to the screen as possible, even if it is significantly above the screen center.
Note that when a particularly short throw distance combines with a very wide screen,
you may have to forfeit some aim and stay more parallel to the screen. In such cases,
some lens offset can reduce the keystone distortion.
Later, when your projector is up-and-running, adjust precise image geometry and
placement as described in 2.7, Basic Image Alignment.
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 of lens).
Calculating Throw Distance
Once you know the screen size and lens type present, calculate the required throw
distance by using the appropriate formula provided in Table 2.3.
NOTES: 1) If your projector is tilted up or down in relation to the screen, typical in
large venues and/or elevated installation, throw distance still represents the smallest
measurement between the screen and front bezel. 2) Remember that throw distances
are calculated from the screen to the front bezel of the projector rather than its foot
centers. To figure throw distance from foot centers, add 8.74" (22.2 cm).
Figure 2.10. Centering 
INSTALLATION AND SETUP
(AERIAL VIEWS)
2-9