Acer P7290 - Manual (Page 28)

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English
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.