Acer P7280I How to get a preferred image size by adjusting distance and zoom

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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 1.9 m from the screen and adjust the zoom
level accordingly.
Desired Distance
Height
Form base to
top of image
1.9m
1.6m
50"
Desired
image size
A
C
D
B