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Diagrams and Distance Charts
The following diagrams show the relationship between projector position and the screen. Refer to the chart below for data.
Distances are in inches. For millimeters multiply by 25.4.
Ceiling
Mounted
Screen Top
Lens Ctr
Screen Ctr
Desktop
Screen Ctr
Lens Ctr
Screen Bottom
Distance chart for popular 4:3 screens
Note: For screen sizes not indicated on the chart,
use the formulas on page 1.
Note: "NA" means it is outside lens range for that
part of the zoom. Refer to "Screen Sizes" in Lens
Specifications on Page 1.
www.necvisualsystems.com
D
B
B
D
Diag
inches inches inches
100
120
150
180
200
250
300
C
Throw Distance
C
Throw Distance
2.5"
Screen Size (4:3)
B
W
H
inches
21
16.8
12.6
5.0
60
48
36
14.3
72
57.6
43.2
17.2
84
67.2
50.4
20.1
90
72
54
21.5
80
60
23.9
96
72
28.7
120
90
35.8
144
108
43.0
160
120
47.8
200
150
59.7
240
180
71.7
6.1"
5.5"
α
Lens Offset from
Mount Pipe
2.7"
α
C
D
wide - tele
wide - tele
inches
inches
NA - 28.7
1.3
69.7 - 84.6
3.7
11.6 - 9.6
83.9 - 101.8
4.4
11.6 - 9.6
98.1 - 119.0
5.1
11.6 - 9.6
105.2 - 127.6
5.5
11.5 - 9.6
117.1 - 141.9
6.1
11.5 - 9.6
140.8 - 170.6
7.3
11.5 - 9.5
176.3 - 213.6
9.2
11.5 - 9.5
211.9 - 256.5
11.0
11.5 - 9.5
235.6 - 285.2
12.2
11.5 - 9.5
294.8 - 356.9
15.3
11.5 - 9.5
354.1 - 428.5
18.3
11.4 - 9.5
VT470/570/670
Page 2 of 6
α
degrees
NA - 9.9
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