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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 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
Table D-1 SXGA+ Throw Formulas
Lens Throw Ratio
0.8 (fixed)
TD = .83*W + 1.46
1.2 (fixed)
TD = 1.15*W + 24.51
1.3-1.7 (zoom)
Min. TD = 1.31*W + 3.18
Max. TD = 1.72*W + 3.12
1.7-2.5 (zoom)
Min. TD = 1.70*W – 6.27
Max. TD = 2.39*W – 6.71
2.5-4.0 (zoom)
Min. TD = 2.45*W + 9.50
Max. TD = 4.01*W – 4.37
4.0-7.0 (zoom)
Min. TD = 3.84*W + 27.84
Max. TD = 6.67*W + 31.06
Table D-2 720P Throw Formulas
Lens Throw Ratio
0.88 (fixed)
TD = .88*W + 1.46
1.31 (fixed)
TD = 1.31*W + 24.51
1.42 – 1.86 (zoom)
Min. TD = 1.42*W + 3.18
Max. TD = 1.86+W + 3.12
1.86 – 2.73 (zoom)
Min. TD = 1.86*W – 6.27
Max. TD = 2.73*W – 6.71
2.73 – 4.38 (zoom)
Min. TD = 2.73*W + 9.50
Max. TD = 4.38*W – 4.37
4.38 – 7.66 (zoom)
Min. TD = 4.84*W + 27.84
Max. TD = 7.66*W + 31.06
Where:
TD = projector distance from the screen to the center of the projector's front feet (cm)
W = screen (image) width (cm)
**preliminary data
Throw Distance
±
(cm, +/-5%)
Throw Distance Formula
(cm, +/-5%)
Throw Distance Formula
Christie DS+60/DW30/Matrix 3000 User's Manual
Appendix D
5%.
Screen Widths **(cm)
Min.
51
79
69
110
73
95
Screen Widths **(cm)
Min.
51
79
69
110
73
95
Max.
289
1208
1114
862
1150
973
Max.
289
1208
1114
862
1150
973
D-1
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