Working With The Lens - Christie CP2000-X User Manual

3.8 Working with
the Lens
Zoom 
Offsets 
Focus 
CP2000-X User Manual
020-100031-01 Rev . 1 (03-2009)
NOTE: See Section 2,
Installation and Setup for
all lens installation and
boresight instructions.
The CP2000 lens mount
secures the primary zoom
lens to the projection head.
It provides 1) setup
adjustments for correct
boresight, and 2) manually
controlled focus, zoom and
offsets for general use.
An optional auxiliary lens
(1.25x or 1.26x) can be
installed into an optional
auxiliary lens mount, then
swung into place in front
of the primary lens to widen a "squeezed" image into a properly proportioned
"scope" auxiliary cinema display. It is typically used in theatres having side masks
that are retracted for "scope" images, or in theatres having fixed side masking but a
very short throw ratio (throw ratio= throw distance/screen width).
With the projector in its permanent location, turn the lens zoom
ring on the CP2000 primary lens to enlarge or shrink the image in
each direction as necessary.
With the projector in its permanent
location, turn the horizontal and/or
vertical offset knobs as necessary so
that the image is square on the
screen—particularly at the top— with
no keystoning. For best results, avoid
extreme offsets. Corner vignettes on a
white test pattern indicate extreme
offsets that should be avoided.
If you need more vertical offset range,
it is possible that CP2000
TILT should be changed to help
compensate for significant differences
in screen and lens height. Refer back to
Section 2.
NOTE: Vertical offset ranges are shown in Figure 2.34.
Figure 3.36. Anatomy of the Lens Mount
's
mechanical
BASIC OPERATION
3-51