www.necvisualsystems.com
LT180 Page
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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 Configuration
Note: Mount shown is NEC HT40CM.
Distance charts for popular 4:3 screens
Lens Ctr
5.5"
Throw Distance
Lens Offset from
Mount Center
1.5"
6.6"
C
B
D
α
Screen Top
Screen Ctr
B
D
Diag
W
H
wide - tele
wide - tele
inches
inches
inches
inches
inches
30
24
18
7.2
31.4 - 37.7
1.8
12.8 - 10.7
60
48
36
14.3
64.8 - 77.3
3.7
12.4 - 10.5
72
57.6
43.2
17.2
78.1 - 93.2
4.4
12.4 - 10.4
84
67.2
50.4
20.0
91.5 - 109.0
5.2
12.3 - 10.4
90
72
54
21.5
98.2 - 116.9
5.5
12.3 - 10.4
100
80
60
23.8
109.3 - 130.1
6.2
12.3 - 10.4
120
96
72
28.6
131.5 - 156.6
7.4
12.3 - 10.4
150
120
90
35.8
164.9 - 196.2
9.2
12.2 - 10.3
180
144
108
42.9
198.3 - 235.8
11.1
12.2 - 10.3
200
160
120
47.7
220.6 - 262.2
12.3
12.2 - 10.3
Screen Size (4:3)
C
inches
α
degrees
