Throw Distance - Christie DS+60 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 the perpendicular distance from the screen to the place
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
Table D-1 Throw Distance Formulas
Lens Throw Ratio Throw Distance Formula (+/-5%)
0.8 (fixed) .84*W+1.53
1.2 (fixed) 1.24*W+3.53
1.3-1.7 (zoom) Min. 1.34*W-1.20
Max. 1.75*W-1.07
1.7-2.5 (zoom) Min. 1.73*W-3.21
Max. 2.49*W-0.40
2.5-4.0 (zoom) TBD
4.0-7.0 (zoom) TBD
** data preliminary
Where:
TD = projector distance from the screen to the center of the projector's front feet.
W = screen (image) width (cm)
NOTE: Quick reference throw distance charts are provided on the following pages.

Throw Distance

±
5%.
(cm)
Christie DS+60 User's Manual
Appendix D
Screen Widths **(cm)
Min. Max.
51 289
79 1208
69 1114
110 862
73 1150
95 973
D-1