You
can use the thumbstick on the projector's control panel to correct
the shape of an image that is unevenly rectangular on the sides.
Note: To
provide the best possible image quality, adjust the projector's
position to correct the image shape. If this isn't possible, use
keystone correction to correct the image shape.
Note:
Keystone corrections are most effective within a projection angle
of 30° from top to bottom.