Acer K330 - 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 1.5 m from the screen, good image quality is possible for image sizes
49.7".
Note: Remind as below figure, the space of 70 cm height is
required when located at 1.5 m distance.
screen size
49.7"
screen size
49.7"
9.7
A
C
1.5m
Desired Distance
Height:
70cm