Lens adjustment, Back focus adjustment | JVC TK-C1480 instruction

CONNECTION/INSTALLATION

Lens adjustment

Connect the camera according to the connection method, turn it on, display an image on the

Back focus adjustment

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.)

Be sure to make back-focus adjustments when a different lens. If required, adjust it as follows:

changing the lens mounting method or using

•With a fixed-focus lens

LEVEL adjustment

L H	LEVEL
Av Pk	ALC

ALC adjustment

•LEVEL adjustment

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-

Back focus adjusting ring

Tighten

Loosen

Back focus fixing screw (M2.6)

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 (	).

(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)

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.

Lens focus ring

MEMO

When the subject is bright, the use of an ND filter permits more accurate back-focus ad- justment. (The ND filter reduces the amount of incident light upon the lens equally over the entire range of wavelength.)

•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