Dell 3400MP - Manual (Page 13)

Using Your Projector 13
Adjusting the Projector Zoom and Focus
CAUTION: To avoid damaging the projector, ensure that the zoom lens and
elevator foot are fully retracted before moving the projector or placing the
projector in its carrying case.
1 Rotate the zoom tab to zoom in and out.
2 Rotate the focus ring until the image is clear. The projector focuses at distances
from 4.9 ft to 39.4 ft (1.5 m to 12 m).
1 Zoom tab
2 Focus ring