IBM iL2120 User Manual page 24

Adjusting the projector
To focus the image, rotate the focus ring 2 (see the following illustration)
until the image is clear. To zoom the image, rotate the zoom ring 1 . This
adjusts the image size without affecting focus.
The projector is equipped with a self-locking, quick-release elevator foot and
button and a leveling knob. To raise the projector:
1. Press and hold the elevator button 1 .
2. Raise the projector to the height that you want, and then release the
button to lock the elevator foot 2 into position. If necessary, turn the
leveling knob 1 (second illustration) at the rear of the projector to adjust
the angle of the projected image.
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iL2120 IBM Value Data/Video Projector, iL2220 Conference Room Data/Video Projector: User's Guide