Ceiling Mounted Installation; Distance Chart - NEC LT260 Installation Manual

Ceiling Mounted Installation

The following diagram shows 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.
Lens Ctr
D
Screen Top
B
Screen Ctr

Distance Chart

(for popular screen sizes)
Screen Size (4:3)
Diagonal Width(H)
inches
30
40
60
67
72
84
90
100
120
150
180
210
240
270
300
350
400
450
500
Note: For screen sizes not indicated on the projection tables, use the formulas on page 1.
www.necvisualsystems.com
*See page 6 for mount base info
Height(V)
inches inches inches
24 18 12.6
32 24 16.8
48 36 25.3
53.6 40.2 28.2
57.6 43.2 30.3
67.2 50.4 35.4
72 54 37.9
80 60 42.1
96 72 50.5
120 90 63.2
144 108 75.8
168 126 88.4
192 144 101.1
216 162 113.7
240 180 126.3
280 210 147.4
320 240 168.5
360 270 189.5
400 300 210.6
C
Throw Distance
C
B
wide - tele
inches
46.4 - 57.0
62.4 - 76.4
94.5 - 115.3
105.8 - 128.9
113.8 - 138.6
133.1 - 161.9
142.7 - 173.6
158.7 - 193.0
190.8 - 231.8
239.0 - 290.1
287.1 - 348.4
335.3 406.7
383.4 464.9
431.6 523.2
479.7 581.5
560.0 678.6
640.2 775.7
720.5 872.9
800.7 - 970.0
*7.2" pipe base
*5.6" flush base
α
Lens Offset from
Mount Center
2.9"
α
D
wide - tele
degrees
inches
3.6 15.2 - 12.5
4.8 15.1 - 12.4
7.3 15.0 - 12.4
8.1 14.9 - 12.3
8.7 14.9 - 12.3
10.2 14.9 - 12.3
10.9 14.9 - 12.3
12.1 14.9 - 12.3
14.5 14.8 - 12.3
18.2 14.8 - 12.3
21.8 14.8 - 12.3
25.4 14.8 12.3
29.1 14.8 12.3
32.7 14.8 12.3
36.3 14.8 12.3
42.4 14.7 12.3
48.5 14.7 12.3
54.5 14.7 12.3
60.6 14.7 - 12.2
LT260/260K
6.8"
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