25
Preparations
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.)
a
is the distance between the lens and the screen, and corresponds to a range of 1.6m to
13.7m (63.0 inches to 539.4 inches).
H
is the height from the image bottom to the center of
the lens.
1 inch=2.54 cm
Screen
As seen from above
90
°
As seen from the side
a
90
°
H
Lens center
projection
size
(inches)
projection distance a (m)
height (H)
(cm)
min length
(zooming max)
max length
(zooming min)
min length
(zooming max)
max length
(zooming min)
40
1.6
1.8
8.7
8.8
60
2.3
2.8
12.5
13.1
80
3.1
3.7
16.8
17.3
100
4
4.7
21.7
21.9
150
6
7.3
32.5
32.9
200
8
9.4
41.9
43.9
250
10
11.7
52.4
54.8
300
12
14.1
65
65.8
projection
size
(inches)
projection distance a (inch)
height (H)
(inch)
min length
(zooming max)
max length
(zooming min)
min length
(zooming max)
max length
(zooming min)
40
63
71
3
3
60
91
110
5
5
80
120
150
7
7
100
160
190
9
9
150
240
290
13
13
200
320
370
16
17
250
390
460
21
22
300
470
560
26
26
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