JVC TK-WD310U Instructions Manual page 29

• With a fixed-focus lens
If the focus can not be adjusted correctly by rotating the lens focus
ring, adjust the back focus as follows.
1.
Loosen the back focus locking screws by turning it counter-
clockwise (
2.
Shoot a pattern closely.
3.
Turn the lens focus ring to ∞.
4.
Turn the back focus adjustment ring to focus at the best point.
5.
Tighten the back focus locking screws by turning it clockwise
( ). (2 locations)
• With a zoom lens
If the image is out of focus when zooming (telephoto wide-angle),
adjust the camera as follows:
1.
Loosen the back focus locking screws by turning it counter-
clockwise (
2.
Shoot a comparatively dark scene with thin lines.
3.
Set the lens to the maximum telephoto position, and adjust
the lens focus.
4.
Set the lens to the maximum wide-angle position, and turn
the back focus ring to adjust the focus.
(Repeat steps 3 . and 4 . two or three times.)
5.
Tighten the back focus locking screws by turning it clockwise
( ). (2 locations)
) with a Phillips screwdriver. (2 locations)
) with a Phillips screwdriver. (2 locations)
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