Installing the projector, Determining the distance to the screen, Inst alling the project or – Canon SX20 User Manual
Page 20
20
INST
ALLING THE PROJECT
OR
INSTALLING THE PROJECTOR
Determining the Distance to the Screen
The projected image size is determined by the distance between the projector lens and
the screen.
Select the place where the desired image size is obtained according to the figure shown
below.
The image size can be adjusted using the Zoom lever by the lens.
H1 and H2: H1 is the height of the screen from the intersection of optical axis and screen
surface, and H2 is the height of the intersection when an image is projected at right angle
to the screen.
• Install the projector at the position where the projection distance is about 1.2 m (3.9') to
9.1 m (29.9'). If the installation position is too close, the image is out of focus. If the
installation position is too far, the screen becomes dark.
• The sizes in the above table have been obtained assuming that the aspect ratio is 4:3.
They may vary from the actual sizes depending on the type of the projected image.
For the relationship between the screen size and projection distance, see the table
on page 85.
Screen
Optical axis when image is projected
at right angle to the screen.
Zoom (max.)
Zoom (min.)
6.0 m (19.7
c)
1.2 m (3.9
c)
2.4 m (7.9
c)
4.5 m (14.8
c)
9.1 m (29.9
c)
40"
81 x 61
80"
163 x 122
60"
122 x 91
100"
203 x 152
150"
305 x 229
182"
370 x 277
200"
406 x 305
-
250"
508 x 381
-
300"
610 x 457
-
Screen size (W x H) cm
Projection distance
Zoom (max)
Projection distance
Zoom (min)
H1
H2
2.0 m
(6.6
c
)
1.2 m
(3.9
c
)
55 cm
(1.8
c
)
6 cm
(0.2
c
)
3.0 m
(9.8
c
)
1.8 m
(5.9
c
)
82 cm
(2.7
c
)
9 cm
(0.3
c
)
4.0 m
(13.1
c
)
2.4 m
(7.9
c
)
110 cm
(3.6
c
)
12 cm
(0.4
c
)
5.0 m
(16.4
c
)
3.0 m
(9.8
c
)
137 cm
(4.5
c
)
15 cm
(0.5
c
)
7.5 m
(24.6
c
)
4.5 m
(14.8
c
)
206 cm
(6.8
c
)
23 cm
(0.8
c
)
9.1 m
(29.9
c
)
5.5 m
(18.0
c
)
250 cm
(8.2
c
)
28 cm
(0.9
c
)
6.0 m
(19.7
c
)
274 cm
(9.0
c
)
30 cm
(1.0
c
)
7.6 m
(24.9
c
)
343 cm
(11.3
c
)
38 cm
(1.2
c
)
9.1 m
(29.9
c
)
411 cm
(13.5
c
)
46 cm
(1.5
c
)