NEC Solutions (America), Inc.
Visual Systems Division
LT30/35 Installation Guide
Ceiling Mounted and Desktop
Rev 1.0
______________________________________________________________________________________________________________________
www.necvisualsystems.com
LT30/35
Page 2 of 6
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
B
C
Lens Ctr
Screen Ctr
Throw Distance
Screen Top
5"
4.75"
Lens Offset From
Mount Pipe
3.35"
Desktop
B
C
Lens Ctr
Screen Ctr
Throw Distance
Screen Bottom
2.38"
Distance Chart for popular 4:3
screens
Screen Size (4:3)
Diag W H
B C
wide - tele
D
α
wide - tele
inches inches inches inches inches inches degrees
30
24
18
9
42 - 51
-
12.1 -10.0
60
48
36
18
86 - 104
-
11.8 - 9.9
72
57.6
43.2
22
104 - 125
-
11.7 - 9.8
84
67.2
50.4
25
121 - 146
-
11.7 - 9.8
90
72
54
27
130 - 156
-
11.7 - 9.8
100
80
60
30
145 - 174
-
11.7 - 9.8
120
96
72
36
174 - 209
-
11.7 - 9.8
150
120
90
45
218 - 261
-
11.7 - 9.8
180
144
108
54
262 - 314
-
11.7 - 9.8
200
160
120
60
291 - 349
-
11.6 - 9.7
260
200
150
78
379 - 454
-
11.6 - 9.7
300
240
180
90
438 - 524
-
11.6 - 9.7
Note:
For screen sizes not indicated on the
projection tables, use the formulas on page 1.
