Epson EB-825 - Manual (Page 21)

Changing the Aspect for video equipment images
EB-825/824/85/84
Each time you press the button, it switches between 4:3 and 16:9.
EB-826W
Each time the button is pressed, it changes in the order Normal, 16:9,
Full, Zoom, and Through.
A Normal
B 16:9
C Full
D Through
E Zoom
Functions for Enhancing Projection
21