Christie DS+4K, User Manual

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Appendix D
Throw Distance
User’s Manual D-1
Calculating Throw Distance
It is important throw distance be precisely calculated for your installation using the
appropriate formula from the chart below. To calculate throw distance you must know
the screen size and the lens type installed in the projector. In general, the larger you
want the image to be the greater the distance you must allow between the lens and the
screen.
NOTES: 1) Throw distance is
measured from the screen to
the center of the projector’s
front feet. 2) This
measurement is not
necessarily parallel to the
floor as the projector and
screen may be inclined. 3)
Due to lens manufacturing,
throw distance calculations
have a tolerance of
±
5%.
Table A-1 Throw Distance Formulas
Screen Widths (cm) Lens Throw
Ratio
Throw Distance Formula
(cm)
Min. Max.
0.73 0.7618*W+6.7624 150 437
1.45-1.8 Min. 1.4789*W-3.6096
Max. 1.8655*W-8.1977
160
127 1102
889
1.8-2.5 Min. 2.0424*W-74.131
Max. 2.6076*W-16.638
160
117 1110
800
2.5-4.5 Min. 2.6347*W-11.428
Max. 4.783*W-29.602
244
137 1118
1110
4.5-7.3 Min. 4.5126*W-6.5502
Max. 7.423*W-25.184
267
165 1110
1095
Where:
TD = projector distance from the screen to the center of the projector’s front feet.
W = screen (image) width (cm)