To adjust the focus:
1.Loosen the focus locking screw.
2.Position the inverted dome approximately 0.125 inch (3.175 mm) from the front of the lens. Make sure that the lens and the dome are centered (refer to Figure 9).
3.Turn the focus locking screw clockwise or counterclockwise to adjust the focus.
4.When the optimal focus is reached, tighten the focus locking screw
ZOOM
FOCUS 
0.125 INCH (3.175 mm)
CENTER BUBBLE
WITH LENS
Figure 9. Adjusting the Focus
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