NEC MultiSync LT245 Installation Manual page 2

Diagrams and Distance Charts for 4:3 Screens
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
Lens Ctr
Screen Ctr
Desktop
Screen Ctr
Lens Ctr
Distance chart for popular 4:3 screens
Note: For screen sizes not indicated on the chart,
use the formulas on page 1.
www.necvisualsystems.com
D
Screen Top
B
B
Screen Bottom
D
Screen Size (4:3)
Diag
inches inches inches
30
60
72
84
90
100
120
150
180
200
250
300
350
400
450
500
C
Throw Distance
C
Throw Distance
3.3"
B
W H wide - tele
inches
inches
24 18 12.5 35.7 - 43.3
48 36 25.1 73.3 - 88.5
57.6 43.2 30.2 88.4 - 106.6
67.2 50.4 35.2 103.5 - 124.7
72 54 37.7 111.0 - 133.7
80 60 41.9 123.6 - 148.8
96 72 50.3 148.7 - 178.9
120 90 62.9 186.3 - 224.1
144 108 75.5 224.0 - 269.3
160 120 83.9 249.1 - 299.5
200 150 104.9 311.9 - 374.8
240 180 125.9 374.6 - 450.2
280 210 146.9 437.4 - 525.5
320 240 167.9 500.2 - 600.9
360 270 188.9 562.9 - 676.2
400 300 209.9 625.7 - 751.5
6.5"
5.8"
α
Lens offset from
mount center
2.5"
α
α
C
D
wide - tele
degrees
inches
3.5 19.4 - 16.2
7.1 18.9 - 15.9
8.6 18.8 - 15.8
10.0 18.8 - 15.8
10.7 18.8 - 15.8
11.9 18.7 - 15.7
14.3 18.7 - 15.7
17.9 18.7 - 15.7
21.5 18.6 - 15.7
23.9 18.6 - 15.7
29.9 18.6 - 15.6
35.9 18.6 - 15.6
41.9 18.6 - 15.6
47.9 18.6 - 15.6
53.9 18.5 - 15.6
59.9 18.5 - 15.6
LT245 Page 2 of 7