NEC LT180 - Manual (Page 19)

E-12
B = Vertical distance between lens center and screen center
C = Throw distance
D = Vertical distance between lens center and bottom of screen for desktop (top of screen for ceiling)
α
= Throw angle
NOTE: Distances may vary +/-5%.
Throw Distance and Screen Size
The following shows the proper relative positions of the projector and screen. Refer to the table to determine the
position of installation.
Distance Chart
(B)
(D)
Screen Bottom
Screen Height
Screen Width
Screen Diagonal
Screen center
Throw Distance (C)
Throw Angle (
α
)
Lens Center
2. INSTALLATION AND CONNECTIONS
α
Screen Size (4:3) B C
Diagonal Width Height wide tele wide tele wide tele
mm
762.0
1016.0
1270.0
1524.0
1701.8
1828.8
2133.6
2286.0
2540.0
3048.0
3810.0
4572.0
5080.0
inch
18.0
24.0
30.0
36.0
40.2
43.2
50.4
54.0
60.0
72.0
90.0
108.0
120.0
mm
457.2
609.6
762.0
914.4
1021.1
1097.3
1280.2
1371.6
1524.0
1828.8
2286.0
2743.2
3048.0
inch
7.1
9.5
11.9
14.3
15.9
17.1
20.0
21.4
23.8
28.5
35.7
42.8
47.6
mm
181.4
241.8
302.2
362.6
404.9
435.1
507.6
543.8
604.2
725.0
906.2
1087.4
1208.2
inch
7.2
9.6
11.9
14.3
16.0
17.2
20.1
21.5
23.9
28.7
35.8
43.0
47.8
mm
182.1
242.8
303.5
364.2
406.7
437.1
509.9
546.3
607.0
728.4
910.5
1092.6
1214.0
inch
31.4
42.5
53.6
64.8
72.5
78.1
91.5
98.1
109.2
131.5
164.8
198.2
220.4
mm
797.7
1080.1
1362.6
1645.0
1842.7
1984.0
2322.9
2492.4
2774.8
3339.7
4187.1
5034.4
5599.3
inch
37.7
50.9
64.1
77.3
86.5
93.1
109.0
116.9
130.1
156.5
196.1
235.8
262.2
mm
957.2
1292.6
1628.0
1963.4
2198.2
2365.9
2768.3
2969.6
3305.0
3975.8
4982.0
5988.2
6658.9
degree
12.8
12.6
12.5
12.4
12.4
12.4
12.3
12.3
12.3
12.3
12.2
12.2
12.2
degree
10.8
10.6
10.6
10.5
10.5
10.5
10.4
10.4
10.4
10.4
10.4
10.3
10.3
D
wide tele
inch
30
40
50
60
67
72
84
90
100
120
150
180
200
mm
609.6
812.8
1016.0
1219.2
1361.4
1463.0
1706.9
1828.8
2032.0
2438.4
3048.0
3657.6
4064.0
inch
24.0
32.0
40.0
48.0
53.6
57.6
67.2
72.0
80.0
96.0
120.0
144.0
160.0
inch
-1.8
-2.4
-3.0
-3.6
-4.0
-4.3
-5.0
-5.3
-5.9
-7.1
-8.9
-10.7
-11.9
mm
-45.2
-60.2
-75.3
-90.3
-100.9
-108.4
-126.4
-135.5
-150.5
-180.6
-225.7
-270.9
-301.0
inch
-1.8
-2.4
-3.0
-3.6
-4.0
-4.3
-5.0
-5.4
-6.0
-7.2
-8.9
-10.7
-11.9
mm
-45.5
-60.2
-75.8
-90.9
-101.5
-109.1
-127.3
-136.4
-151.5
-181.8
-227.3
-272.7
-303.0