JVC TK-C1431 Lens adjustment Back focus adjustment,
Back focus adjustment, Level adjustment

Turn the lens focus ring to ￿.

CONNECTION/INSTALLATION

Lens adjustment

Connect the camera according to the connection method, turn it on, display an image on the monitor, and check the image. The camera has been factory-adjusted to the best position, but it may need to be adjusted according to the object conditions or combination of lenses. If the image is unnatural, adjust it as follows: (Also read the instruction manual of the lens.)

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

LEVEL adjustment

• LEVEL adjustment

filter acts to reduce the amount of incident light entering the lens evenly over the entire

wavelength band.)

L H	LEVEL
Av Pk	ALC

ALC adjustment

(Does not operate.)

MEMO

Note that the lens cannot make ALC adjust- ments. Make ALC adjustments using the item

Monitor screen	LEVEL turning direction
Too bright	Counterclockwise (Toward L)
Too dark	Clockwise (Toward H)

MEMO

• If the sensitivity adjustment LEVEL is

turned excessively to L, the sensitivity in-

creases because of the AGC function of

the camera, and the image looks grainy.

• If the video iris lens is set to too low a level,

malfunction such as the hunting phenom-

enon, in which the iris opens or closes

unintentionally, may occur.

In such a case, first set LEVEL potentiom-

eter on the lens to the H (iris open) posi-

tion then adjust it to the optimum level.

Back focus adjustment ring

Tighten

Loosen

Back focus locking screw (M2.6)

Lens focus ring

• 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 ( ) with a screwdriver.

2. Shoot a pattern closely.

3.

4. Turn the back focus adjustment ring to focus at the best point.

5. Tighten the back focus locking screw by turning it clockwise ( ).

AVERAGE: PEAK on the menu.

• With a zoom lens

( Page 26)

MEMO

•LENS FOCUS ADJUSTMENT MODE

At the time of focus adjustment, press the

button at the side of the unit for at least one second to open the lens iris and to fa- cilitate focusing. At this time, “LENS FOCUS ADJUSTMENT MODE” will be displayed on the monitor screen.

When the adjustment has been completed,

press one of the buttons to can- cel focus adjustment mode.

•Focus setting can differ on the colour and on the black and white screen. Make ad- justments so that the focus will come to the optimum on both screens.

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 ( ) with a 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 ( ).

E-20 E-21