Casio XJ-450 User Manual page 17

General Guide
6
Lens
Warning
7
Sensors
Caution
: Projects the image from the projector.
Never look into the lens while the projector is turned on.
: Measures the distance between the projector and screen.
Finger smudges or dirt on the sensors can cause keystone
correction problems. Should the sensors ever become soiled, wipe
them clean using a commercially available lens cloth or optical lens
paper, like those for eyeglasses or camera lenses.
17