Back Focus Adjustment - JVC TK-C1460 Instructions Manual

Back focus adjustment

Back focus adjustment
Be sure to make back-focus adjustments when changing the lens mounting method or using
a different lens. If required, adjust it as follows:
To make accurate back focus adjustments, use the electronic shutter and the ND filter,
and carry out the following adjustments in a state where the lens iris is released. (The ND
filter acts to reduce the amount of incident light entering the lens evenly over the entire
wavelength band.)
Back focus
adjustment ring
Loosen
Lens focus ring
MEMO
Focus setting can differ on the color and on
the black and white screen. Make adjust-
ments so that the focus will come to the opti-
mum on both screens.
Tighten
Back focus locking
screw (M2.6)
• 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 screw by
turning it counterclocckwise (
screwdriver.
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 screw by
turning it clockwise (
• 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 screw by
turning it counterclocckwise (
screwdriver.
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 screw by
turning it clockwise (
) with a
).
) with a
).
E-21