Acer P1223 - Manual (Page 21)

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Optimizing 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 68" and 75".
Note: The image will be 148 cm high when the projector is 3 m from
the screen.
Max screen size
75"
Min screen size
68"
Min screen size
68"8"
A
C
B
3 m
Desired distance
Height: 148 cm
From base to
top of image
Height:
135 cm