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Placement (Continued)
Projection Distance and Size
Use the figures, tables, and formulas below to determine the projection size and projection
distance. (Projection sizes are approximate values for full-size picture with no keystone
adjustment.)
As seen from above
Screen
90
As seen from the side
Lens center
H
90
a
a is the distance (cm, feet) between the lens and the screen, and corresponds to a range of
1 m to 11.88m (3.28 ft. to 38.97 ft.). H is the height (cm, feet) from the image bottom to the
center of the lens.
min length
a(cm)= -0.000381 x projection size (inches)
a(feet)= -0.0000125 x projection size (inches)
max length
a(cm)= -0.000365 x projection size (inches)
a(feet)= -0.000012 x projection size (inches)
height
H(cm)= projection size (inches) x 0.2286
H(feet)= projection size (inches) x 0.0075
projection
Wide
size
distance
(inches)
(m)
(feet)
23.9
---
30
1.15
40
1.56
60
2.37
80
3.18
100
3.98
150
5.99
200
7.97
250
9.93
300
11.88
2
+ 4.1 x projection size (inches) - 7.8
2
+ 0.135 x projection size (inches) - 0.256
2
+ 4.52 x projection size (inches) - 7.7
2
+ 0.148 x projection size (inches) - 0.253
22
Tele
distance
(m)
(feet)
---
1.00
3.28
3.77
1.28
4.19
5.10
1.73
5.66
7.77
2.62
8.60
10.43
3.52
11.53
13.07
4.41
14.46
19.64
6.62
21.72
26.15
8.82
28.93
32.59
10.99
36.07
38.97
---
---
Offset
height (H)
(cm)
(feet)
5.5
0.18
6.9
0.23
9.1
0.30
13.7
0.45
18.3
0.60
22.9
0.75
34.3
1.13
45.7
1.50
57.2
1.88
68.6
2.25