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