NEC Solutions (America), Inc.
Visual Systems Division
LT280 Installation Guide
Ceiling Mounted and Desktop
Rev 1.1
www.necvisualsystems.com
LT280
Page 2 of 6
Diagrams and Distance Charts
The following shows the proper relative positions of the projector and screen. Refer to the table to determine the position of
installation.
Distances are in inches. For millimeters multiply by 25.4.
Ceiling Mounted
Desktop
Distance Chart for popular 4:3 screens
Note:
For screen sizes not indicated on the projection
tables, use the formulas on page 1.
Screen Size (4:3)
Diag
W
H
inches inches inches inches
inches
30
24
18
7
-2
60
48
36
14
-4
72
57.6
43.2
17
-5
84
67.2
50.4
20
-5
90
72
54
21
-6
100
80
60
24
-6
120
96
72
29
-7
150
120
90
36
-9
180
144
108
43
-11
200
160
120
48
-12
250
200
150
60
-15
300
240
180
72
-18
B
C
wide - tele
D
α
wide - tele
inches
degrees
34 - 41
9.8 - 11.9
69 - 84
9.6 - 11.7
83 - 102
9.6 - 11.6
98 - 119
9.6 - 11.6
105 - 127
9.6 - 11.6
117 - 141
9.6 - 11.6
141 -170
9.6 - 11.5
176 - 213
9.5 - 11.5
211 - 256
9.5 - 11.5
354 - 428
9.5 - 11.5
235 - 285
9.5 - 11.5
294 - 356
9.5 - 11.5
B
C
Lens Ctr
Screen Ctr
Throw Distance
Screen Bottom
2.54"
B
C
Lens Ctr
Screen Ctr
Throw Distance
Screen Top
6.30"
5.65"
Lens Offset From
Mount Pipe
2.62"
D
D
