Acer PROJECTOR P7203 - Manual (Page 26)

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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 50" set
the projector at a distance 1.6 m and 2.4 m from the screen and adjust the zoom
level accordingly.
Desired Distance
Height
Form base to
top of image
1.6 m
2.4 m
50"
Desired
image size
A
C
D
B