Acer P1266i - Manual (Page 24)

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English
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 77" and 92".
Note: Remind as below figure, the space of 162 cm height is
required when located at 3m distance.
Figure: Fixed distance with different zoom and screen size.
Max screen size
92"
Min screen size
77"
Min screen size
77" 7
A
C
B
3m
Desired Distance
Height: 162cm
Form base to
top of image
Height:
135cm