Acer K11 Manual De Usuario

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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 
71".
¥
Note: Remind as below figure, the space of 118 cm height is 
required when located at 3m distance.
screen size
71"
screen size
71"
1
A
C
3m
Desired Distance
Height: 
118cm