Vertical And Horizontal Position - Runco Video Xtreme VX-40d Owner's Operating Manual

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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 using 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 2.2 for some illustrated examples
of vertical offset.
Table 2.1 along with Figure 2.3 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 for the VX-40d / VX-50d
Vertical Offset
Lens Type
(% of Half Height)
% Pixels
0.8:1 fixed 37% +/-196
1.65-1.95:1 zoom 100% +/-525
2.04-2.73:1 zoom 100% +/-525
2.86-4.83:1 zoom 100% +/-525
4.96-7.90:1 zoom 100% +/-525
% Offset = # pixels of offset / half panel resolution x 100.
Table 2.1 Lens Offsets for the VX-60d / VX-80d
Vertical Offset
Lens Type
(% of Half Height)
% Pixels
0.75:1 fixed 37% +/-196
1.48-1.75:1 zoom 100% +/-525
1.81-2.40:1 zoom 100% +/-525
2.56-4.35:1 zoom 100% +/-525
4.48-7.15:1 zoom 100% +/-525
% Offset = # pixels of offset / half panel resolution x 100.
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Figure 2.1 Estimating Throw Distance
Maximum amount of Horizontal Offset
projected image above (% of Half Width)
or below lens center
% Pixels %
69% +/-721 22%
100% +/-1050 50%
100% +/-1050 50%
100% +/-1050 50%
100% +/-1050 50%
Maximum amount of Horizontal Offset
projected image above (% of Half Width)
or below lens center
% Pixels %
69% +/-721 22%
100% +/-1050 50%
100% +/-1050 50%
100% +/-1050 50%
100% +/-1050 50%
Maximum amount of
projected image to one
side of lens center
Pixels % Pixels
+/-153 61% +/-853
+/-350 75% +/-1050
+/-350 75% +/-1050
+/-350 75% +/-1050
+/-350 75% +/-1050
Maximum amount of
projected image to one
side of lens center
Pixels % Pixels
+/-153 61% +/-853
+/-350 75% +/-1050
+/-350 75% +/-1050
+/-350 75% +/-1050
+/-350 75% +/-1050
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Section 2: Installation and Setup