BenQ PB8120 - Manual (Page 19)

Operation 15
Digital Keystone Correction
Keystoning refers to the situation
where the projected image is
noticeably wider at either the top or
bottom. To correct this, press
KEYSTONE +/- (hot key) on the
control panel of the projector or on
the remote control, and then adjust
the sliding bar labeled Keystone, as
needed. Press + to correct
keystoning at the top of the image.
Press - to correct keystoning at the
bottom of the image.
Auto Adjustment
In some cases, you may need to optimize the
picture quality. To do this, press the AUTO
key on the control panel of the projector or
on the remote control. Within 3 seconds,
the built-in Intelligent Auto Adjustment
function will re-adjust settings to provide
the best picture quality.