Ceiling Mounted Installation; Desktop Setup - NEC VT770 Installation Manual

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

Screen Top
Lens Ctr
Screen Ctr

Desktop Setup

Screen Ctr
Lens Ctr
Screen Bottom
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
B
B
D
C
Throw Distance
*6.6" w/pipe connector
*5.7" w/ceiling plate
α
C
Throw Distance
2.7"
Screen Size (4:3)
Diag W H
inches inches inches inches
25 20 15 6.0
60 48 36 14.4
72 57.6 43.2 17.3
84 67.2 50.4 20.2
90 72 54 21.6
100 80 60 24.0
120 96 72 28.8
150 120 90 36.0
180 144 108 43.2
200 160 120 48.0
250 200 150 60.0
300 240 180 72.0
4.9"
Lens offset from
mount pipe
3.2"
α
C
B D
wide - tele (4:3)
inches
inches
28.0 - 34.3 1.5
69.8 - 84.8 3.6
84.2 - 102.2 4.3
98.5 - 119.5 5.0
105.6 - 128.2 5.4
117.6 - 142.6 6.0
141.5 - 171.5 7.2
177.3 - 214.9 9.0
213.1 - 258.2 10.8
237.0 - 287.1 12.0
296.7 - 359.3 15.0
356.4 - 431.5 18.0
VT770 Page 2 of 7
α
wide - tele
degrees
12.1 - 9.9
11.7 - 9.6
11.6 - 9.6
11.6 - 9.6
11.6 - 9.6
11.5 - 9.6
11.5 - 9.5
11.5 - 9.5
11.5 - 9.5
11.4 - 9.5
11.4 - 9.5
11.4 - 9.5