Christie roadie 25k User Manual page 18

INSTALLATION AND SETUP
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Roadie 25K User's Manual
NOTES: 1) Assumes full 2048 x 1080 display. 2) Recommended offset range can
sometimes be exceeded, however this may affect image quality. 3) Due to
manufacturing tolerances, an offset range can vary ±5% or more between lenses
described as having the same throw ratio, between projectors, and with any
lens/projector combination. 4) Simultaneous horizontal and vertical offset can limit
the adjustment range of each, as can long throw distances.
ALTERNATIVE METHOD OF DESCRIBING VERTICAL OFFSET:
specified as the distance traveled from lens center (such as 270 pixels) and expressed
as a percentage (270 pixels=50%) of half of the image height. This concept of image
movement is illustrated in the example below:
Figure 2.13. Example of Alternative Offset Specification
For any projector, if you find that you cannot raise or lower the image enough using
mechanical vertical offset, try adjusting V-Position in the Size and Position menu
Figure 2.12. Vertical Offset Range
Offset can also be