Runco Video Xtreme VX-40d Owner's Operating Manual page 16

Section 2: Installation and Setup
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. See Figure 2.2 for some illustrated examples
of vertical offset.
Figure 2.2 Examples of Vertical Offset
Runco VX-40d/-50d/-60d/-80d Owner's Operating Manual
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