Working With The Lenses - Christie roadie 25k User Manual

3.13 Working with
the Lenses
Zoom
Offsets
For complete information, including a list of valid ASCII messages and how to
structure them for use, obtain the current Christie Serial Communications document.
NOTE: See Section 2,
Installation and Setup for
all lens installation and
boresight instructions.
The 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.
As necessary for your
application, use either
standard high-brightness
lenses or optional high-
contrast lenses. The latter
can be identified by the "plump football" shape aperture visible within the lens.
An optional anamorphic lens (1.25x) can be installed into an optional anamorphic
lens mount, then swung into place to widen a "squeezed" image into a properly
proportioned "scope" display. It is typically used with screens having side masks that
are retracted for "scope" images, or in rooms having fixed side masking but a very
short throw ratio (throw distance/screen width).
'
With the projector in its permanent location, turn the lens zoom
ring on the primary lens to enlarge or shrink the image in each
direction as necessary.
'
Turn the horizontal and/or vertical
offset knobs as necessary so that the
image is square on the screen with no
keystoning. For best results, avoid
extreme offsets characterized by corner
vignettes on a white test pattern.
For more vertical offset range, it is
possible that mechanical TILT should
be changed to help compensate for
significant differences in screen and
lens height. Refer back to Section 2.
NOTE: Refer back to Figure 2.13 and
Figure 2.14.
Figure 3.36. Anatomy of the Lens Mount
Roadie 25K User's Manual
OPERATION
3-65