Projector Christie Roadster X4 User Manual

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							Appendix D
Serial Communication Cables
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When connecting a Roadster and/or Vista projector to a computer, another projector, or a 
Marquee Signal Switcher,
use the appropriate serial communication shielded cabling as illustrated. 
						

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							Appendix E
Throw Distance
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Always consult this Appendix when planning a projector installation. See also 2.3, Projector Position and Mounting.
Calculating Throw Distance
Correct throw distance depends on the screen size and lens present—the larger the image
needed, the greater the distance you must allow between the lens and screen. Once you
know the screen size and lens type present, you can calculate the precise throw distance you
require by using the
appropriate formula as
found in this appendix.
Throw distance is the
distance between the
projector front feet and the
screen. This measurement
is not necessarily parallel to
the floor—i.e., the projector
and screen may be inclined.
NOTE: If your projector
is tilted up or down in
relation to the screen, as
is sometimes the case for large venues or elevated installations, throw distance still
represents the smallest measurement between the screen and front feet center axes.
Pre-calculated throw distances for the complete range of lens types and screen sizes
appear in the charts and graphs on the following pages. Refer to these examples to
quickly determine the proper throw distance (±5%) for your installation and lens.
NOTE: Variable operating ranges for zoom lenses appear in graphs only.
Table E-1. Throw Distance Formulas
Lens Throw RatioThrow Distance Formula (ft.) ±5%Diagonal Screen Size ➹ (ft.)
0.8:1 (VistaGRAPHX).79 x screen width (↔ ft.) + .81 5-25
1.2:1 1.24 x screen width (↔ ft.) + .82 5-30
1.5-2.2:1 zoom Min: 1.52 x screen width (↔ ft.) + .57
Max: 2.26 x screen width (↔ ft.) + .445-40
2.2-4:1 zoom Min: 2.23 x screen width (↔ ft.) + .61
Max: 4.09 x screen width (↔ ft.) + .365-40
2.5-4:1 zoom(VistaGRAPHX)Min: 2.44 x screen width (↔ ft.) + .90
Max: 3.92 x screen width (↔ ft.) + .725-40
4-7:1 zoom Min: 4.03 x screen width (↔ ft.) + .57
Max: 7.13 x screen width (↔ ft.) + .278-40
4-7: zoom (VistaGRAPHX)Min: 3.93 x screen width (↔ ft.) + .66
Max: 6.85 x screen width (↔ ft.) + .5110-40
NOTES: 1) Make sure to use HORIZONTAL screen size in all formulas. 2) The 0.8:1 lens is not recommended for use in “S” models. 
						

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