NEC VT470 Installation Manual page 2

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
Screen Top
Lens Ctr
Screen Ctr
Desktop
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.
Note: "NA" means it is outside lens range for that
part of the zoom. Refer to "Screen Sizes" in Lens
Specifications on Page 1.
www.necvisualsystems.com
D
B
B
D
Diag
inches inches inches
100
120
150
180
200
250
300
C
Throw Distance
C
Throw Distance
2.5"
Screen Size (4:3)
B
W H
inches
21 16.8 12.6 5.0
60 48 36 14.3
72 57.6 43.2 17.2
84 67.2 50.4 20.1
90 72 54 21.5
80 60 23.9
96 72 28.7
120 90 35.8
144 108 43.0
160 120 47.8
200 150 59.7
240 180 71.7
6.1"
5.5"
α
Lens Offset from
Mount Pipe
2.7"
α
C
D
wide - tele
inches
inches
NA - 28.7 1.3
69.7 - 84.6 3.7
83.9 - 101.8 4.4
98.1 - 119.0 5.1
105.2 - 127.6 5.5
117.1 - 141.9 6.1
140.8 - 170.6 7.3
176.3 - 213.6 9.2
211.9 - 256.5 11.0
235.6 - 285.2 12.2
294.8 - 356.9 15.3
354.1 - 428.5 18.3
VT470/570/575/670/676
α
wide - tele
degrees
NA - 9.9
11.6 - 9.6
11.6 - 9.6
11.6 - 9.6
11.5 - 9.6
11.5 - 9.6
11.5 - 9.5
11.5 - 9.5
11.5 - 9.5
11.5 - 9.5
11.5 - 9.5
11.4 - 9.5
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