Acer H7532BD - How to optimize image size and distance

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How to optimize image size and distance
Consult the table below to find the optimal image sizes achievable when the
projector is positioned at a desired distance from the screen. Example: If the
projector is 3 m from the screen, good image quality is possible for image sizes
between 75" and 90".
Note: Remind as below figure, the space of 131 cm height is
required when located at 3m distance.
Figure: Fixed distance with different zoom and screen size.
90"
75"
75"
5
A
C
B
Height: 131 cm
from base to
top of image
Height:
109 cm
3 m Desired Distance
M
a
x
s
c
r
e
e
n
s
i
z
e
M
i
n
s
c
r
e
e
n
s
i
z
e