Acer P7215 - Manual (Page 24)

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How to get a preferred image size by adjusting
distance and zoom
The table below shows how to achieve a desired image size by adjusting either
the position or the zoom ring. For example: to obtain an image size of 60" set
the projector at a distance 2.44 m and 2.93 m from the screen and adjust the
zoom level accordingly.
Desired Distance
2.93 m
2.44 m
Height
For base to
top of image
60"
Desired
image size