Correcting Keystone Effect; Adjusting Vertical Boresight - Christie CP2308-C Installation And Setup Manual

Correcting keystone effect

Learn how to adjust the image to correct keystone effect.
Keystone effect occurs when you project an image onto the screen at an angle and the projector is not
centered on the screen. As a result, the image appears distorted and resembles a trapezoid.
If the image suffers from slight keystone effect, it can be corrected with electronic cropping.
If the keystone effect is severe, you can unevenly adjust the feet to compensate for projector tilt. It is
recommended that you use lens offset to align the center of the image to the center of the screen
before you correct the keystone effect.
If one side of the image is longer than another, adjust the tilt and level of the projector (on page 10).
Horizontal keystone
Projector tilted horizontally to the screen

Adjusting vertical boresight

Perform a top and bottom boresight adjustment to fix image focus issues that cannot be corrected by
aligning the projector to the screen and focusing the lens.
Caution! Failure to comply with the following could result in minor or moderate injury.
• This procedure must be performed by Christie qualified technicians.
Ensure that the projector is perpendicular to the screen before adjusting boresight.
We recommend that you complete a top and bottom boresight adjustment before adjusting the
horizontal boresight.
A boresight adjustment should only be made when the image cannot be focused uniformly on the
screen by aligning the projector to the screen and focusing the lens. When adjusting boresight, you
must maintain the boresight distance from the lens to the prism plane set by Christie. For example,
when you move the top screw outward, turn the bottom two boresight screws to maintain the overall
distance.
Ensure that the boresight lockdown screws are adequately tightened. Not adequately tightening the
boresight screws can result in excessive onscreen image vibration. After adjusting boresight, evaluate
the onscreen image vibration and re-adjust if needed.
CP2308-C Installation and Setup Manual
020-102492-01 Rev. 1 (01-2017)
Copyright 2017 Christie Digital Systems USA Inc. All rights reserved.
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Vertical keystone
Projector tilted vertically to the screen
Adjusting the image
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