InFocus Work Big IN38 Reference Manual page 12

Adjust the zoom or focus rings by rotating them until the desired image size
and focus are produced.
If the image is not square, adjust the vertical keystone using the buttons on
the keypad.
Press the upper Keystone button to reduce the upper part of the image, and
press the lower Keystone button to reduce the lower part.
You can also adjust the keystone via the menus. See page 25.
Adjust the volume on the keypad.
Adjust the Contrast, Brightness, Color, or Tint in the Picture menu.
See page 24 for help with the menus.
djust zoom and focus
adjust keystone
adjust volume
adjust Picture menu
11
Zoom
(rear)
Focus
(front)