Throw Distance - Christie DS+5K User Manual

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
Lens Throw Ratio
0.73 0.7618*W+6.7624
1.2521*W+10.817
.2:1
1
(long throw)
1.45-1.8 Min. 1.4789*W-3.6096
Max. 1.8655*W-8.1977
1.8-2.5 Min. 2.0424*W-74.131
Max. 2.6076*W-16.638
2.5-4.5 Min. 2.6347*W-11.428
Max. 4.783*W-29.602
4.5-7.3 Min. 4.5126*W-6.5502
Max. 7.423*W-25.184
NOTES: 1.2:1 (short throw) lens information not available at time of printing. Calculations are not
shown for 1.2:1 (long throw) lenses.
Where:
TD = projector distance from the screen to the center of the projector's front feet.
W = screen (image) width (cm)

Throw Distance

Throw Distance Formula (cm)
Appendix D
Screen Widths (cm)
Min. Max.
150 437
79 812
160 1102
127 889
160 1110
117 800
244 1118
137 1110
267 1110
165 1095
User's Manual D-1