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2-8
INSTALLATION AND SETUP
Vertical & Horizontal Position
THE VERTICAL POSITION of the projector in relation to the screen also depends on
the size of the screen and the lens type. Correct vertical position helps ensure that the image will
be rectangular in shape rather than keystoned (having non-parallel sides) and that image focus and
brightness both remain optimized.
In addition, vertical position of the image can be manually offset-that is, moved up or
down-by turning the top screw on the front of the projector (the bottom screw if the projector is
ceiling mounted). The range of adjustment is roughly 130%, depending on the specific lens you
are using and whether or not you are also offsetting horizontally. See Table 2.1 for the percentage
of the image that can be displayed above and below the center of each type of lens designed for
this projector. These image offsets are also illustrated in Figure 2.6 (fixed lenses) and Figure 2.7.
Figure 2.6. Maximum Vertical Offsets (FIXED LENSES)
Table 2. 1. Maximum % of Image Offset from Lens Center
Lens Type
Max. Recommended Image Offset
*
0.8:1
105%
100%
1.2:1
126%
133%
1.5 - 2.2:1
129%
117%
2.2 - 4:1
129%
117%
4-7:1
137%
126%
*
NOTE: This lens is the same as the VX -3 0.8:1 lens