BenQ PX9210 User Manual page 21

Adjusting the Zoom/Focus
You may turn the zoom ring to zoom in or out. To focus the image, rotate the focus ring
until the image is clear. The projector will focus at distances. See page 22.
Focus ring Zoom ring
Use the keystone buttons to correct image
distortion. They can be found on the remote
control and on the projector's control panel.
Positioning your projector 21