Christie 1920-DX, User Manual

Page: 14 / 172

Section 2: Installation and Setup
2-6 013-100199-04
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 (lens center) by adjusting the fully motorized lens mount with the keypad.
The amount of vertical offset available depends directly on the lens installed in the
projector and can be slightly limited if horizontal offset has been applied. Vertical
offset can also be expressed as the percent of half the image height OR the number of
pixels of shift from lens center. Refer to Figure 2.1 for some illustrated examples of
vertical offset.
Table 2.1 along with Figure 2.2 show the maximum vertical offset of a lens or
alternatively, how much of your projected image will appear above or below lens
center if the maximum vertical offset is applied using that lens.
Table 2.1. Lens Offsets
Lens Type Offset Movement
(All motorized
lenses)
or
»
or
Max. Amount of Display
Above or Below Lens Center
Max. Amount of Display
Right or Left of Lens Center
SXGA+ Lenses 100%
(525 pix)
50%
(350 pix)
1050 pixels or 100% 1050 pixels
»
or 75%
HD Lenses 100%
(540 pix)
50%
(960 pix)
1080 pixels or 100% 1440 pixels
»
or 75%
NOTES: 1) Offsets are subject to
±
7% centering tolerance 2) % Offset = # pixels of offset / half panel resolution x
100.
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