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 Installation
www.necvisualsystems.com
VT770
Page 2 of 7
Desktop Setup
α
C
Throw Distance
Screen Bottom
Lens Ctr
Screen Ctr
B
D
2.7"
α
C
Throw Distance
Screen Top
Lens Ctr
Screen Ctr
B
D
*5.7" w/ceiling plate
*6.6" w/pipe connector
4.9"
3.2"
mount pipe
Lens offset from
Distance chart for popular 4:3 screens
B
D
Diag
W
H
wide - tele
(4:3)
wide - tele
inches
inches inches
inches
inches
25
20
15
6.0
28.0 - 34.3
1.5
12.1 - 9.9
60
48
36
14.4
69.8 - 84.8
3.6
11.7 - 9.6
72
57.6
43.2
17.3
84.2 - 102.2
4.3
11.6 - 9.6
84
67.2
50.4
20.2
98.5 - 119.5
5.0
11.6 - 9.6
90
72
54
21.6
105.6 - 128.2
5.4
11.6 - 9.6
100
80
60
24.0
117.6 - 142.6
6.0
11.5 - 9.6
120
96
72
28.8
141.5 - 171.5
7.2
11.5 - 9.5
150
120
90
36.0
177.3 - 214.9
9.0
11.5 - 9.5
180
144
108
43.2
213.1 - 258.2
10.8
11.5 - 9.5
200
160
120
48.0
237.0 - 287.1
12.0
11.4 - 9.5
250
200
150
60.0
296.7 - 359.3
15.0
11.4 - 9.5
300
240
180
72.0
356.4 - 431.5
18.0
11.4 - 9.5
Screen Size
(4:3)
C
inches
α
degrees
Note: For screen sizes not indicated on the chart,
use the formulas on page 1.
