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
Screen Top
α
Screen Ctr
Lens Offset from
Mount Pipe
Lens Ctr
Throw Distance
5.5"
C
6.1"
2.7"
D
B
Mounted
Throw Distance
Screen Bottom
Screen Ctr
2.5"
α
Lens Ctr
C
D
B
Desktop
Distance chart for popular 4:3 screens
B
D
Diag
W
H
wide - tele
wide - tele
inches
inches
inches
inches
inches
21
16.8
12.6
5.0
NA - 28.7
1.3
NA - 9.9
60
48
36
14.3
69.7 - 84.6
3.7
11.6 - 9.6
72
57.6
43.2
17.2
83.9 - 101.8
4.4
11.6 - 9.6
84
67.2
50.4
20.1
98.1 - 119.0
5.1
11.6 - 9.6
90
72
54
21.5
105.2 - 127.6
5.5
11.5 - 9.6
100
80
60
23.9
117.1 - 141.9
6.1
11.5 - 9.6
120
96
72
28.7
140.8 - 170.6
7.3
11.5 - 9.5
150
120
90
35.8
176.3 - 213.6
9.2
11.5 - 9.5
180
144
108
43.0
211.9 - 256.5
11.0
11.5 - 9.5
200
160
120
47.8
235.6 - 285.2
12.2
11.5 - 9.5
250
200
150
59.7
294.8 - 356.9
15.3
11.5 - 9.5
300
240
180
71.7
354.1 - 428.5
18.3
11.4 - 9.5
Screen Size
(4:3)
C
inches
α
degrees
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
VT470/570/670
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