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3. Adjust the Focus using the focus knob to retract the lens. Watch the image at the left edge of the screen
until it comes into focus. If the entire screen is in focus, proceed to step 7.
4. Continue retracting the lens.
a. If the right side of the image comes into
focus before the lens is completely retracted,
adjust the horizontal boresight bolt to bal-
ance the left and right edges.
b. If the right side of the image fails to come
into focus, adjust the horizontal boresight
bolt.
5. When both sides appear equally blurry, adjust
the horizontal or vertical offset to re-center the
image.
6. Repeat steps 1 - 5 until both sides of the image
are focused.
7. Tighten the horizontal hold screw to maintain
your adjustments.
8. Check the boresight again.
D4K25 User Manual
020-100882-02 Rev.1 (7-2012)
Figure 4-2 Adjust Focus
Section 1: Introduction
Figure 4-3 Aerial View Illustrating
Misaligned Boresight
4-3
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