Christie J Series User Manual page 27

IMPORTANT!
Vertical and horizontal position
The correct vertical and horizontal position of the projector in relation to the screen depends on the lens type
and the screen size. Ideally, the projector should be positioned perpendicular to the screen. This way, the image
will appear rectangular instead of keystoned (trapezoidal).
The vertical position of the image can be offset (that is moved above or below the optical axis) by adjusting the
motorized lens mount. The amount of vertical offset available depends on the type of lens installed in the
projector and can be limited if horizontal offset has been applied. Vertical offset can be expressed as the
percent of half the image height or the number of pixels of shift from lens center. Refer to
illustrated examples of vertical offset.
Table 2.1, Table 2.2
J Series 1000W and 1200W User Manual
020-100706-02 Rev. 1 (03-2014)
Use the lens and screen size to calculate the precise throw distance using the tables provided
in the Dealer Section of the Christie Website, PN 020-100221-XX. Due to lens manufacturing
tolerances for lens focal length, actual throw distance can vary
same nominal throw ratio.
and Table 2.3 specify the vertical offset of each type of lens.
F 2-10
IGURE
Section 2: Installation and Setup
5% between lenses with the
±
Figure 2-11 for
2-11