Acer H5350 ユーザーズマニュアル

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