JVC TK-C1460B Lens adjustment Back focus adjustment,
Back focus adjustment, Level adjustment

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
Monitor screen	LEVEL turning direction

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 AVERAGE: PEAK on the menu. ( Page 26)

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

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 color and on the black and white screen. Make adjust- ments so that the focus will come to the op- timum on both screens.

• 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
2.	screwdriver.
	Shoot a pattern closely.
3.	Turn the lens focus ring to ￿.
4.	Turn the back focus adjustment ring to
5.	focus at the best point.
	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 (		) with a
2.	screwdriver.
	Shoot a comparatively dark scene with
3.	thin lines.
	Set the lens to the maximum telephoto
4.	position, and adjust the lens focus.
	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
5.	times.)
	Tighten the back focus locking screw by
	turning it clockwise (	).

E-20 E-21