2.0 INSTALLATION GUIDELINES
R599790 - FORCE Series User Manual
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4) S-Video using two BNC cables, with Luma (Y) connected to 4 (Sy) and Chroma (C) connected to 6 (Sc).
2.7
Projector Distance, Offset Setting and Mounting
Throw Distance
Throw distance is the distance measured from your projector’s front feet to the screen. This calculation determines
if there is enough room to install your projector with a desired screen size
To estimate the throw distance take the horizontal width of the screen and multiply it by the lens throw ratio. The
result determines approximately the distance the projector should be positioned from the screen to project a
focused image large enough to fill the screen. For example, using a 0.67:1 Throw Ratio lens, throw distance (D)
would roughly be 0.67 (TR) x Screen base width (B).
Throw distance
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 to avoid any keystone
correction and to obtain the best picture possible.
The vertical position of the image can be offset (that is moved above or below the optical axis) by adjusting the
motorized lens mount. The amount of vertical offset available depends on the type of lens installed in the projector
and can be limited if horizontal offset has been applied.
Vertical offset can be expressed as the percent of the image height or the number of pixels of shift from lens center.
•
When no offset is applied, the image is centered with the lens center.
•
When 50% offset is applied, the image is shifted above the center of the lens by an half of the total image height.
Due to lens manufacturing tolerances for lens focal length, actual throw distance can vary ±5% between
lenses with the same nominal throw ratio
Refer to APPENDIX “Appendix: Projection Distances”, page 93 for screen size and projection distances
tables.
Screen base width (B)
Throw distance (D)
0% offset
50% offset
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