JVC GY-DV550 13-4, Gain Sensitivity Adjustment, Gain Switching, Switch Functions, Operation

	13. FEATURES OF THE CAMERA SECTION
13-4	Gain (Sensitivity) Adjustment
The gain should be switched when the brightness is insufficient due to poor lighting conditions.

13. FEATURES OF THE CAMERA SECTION 13-5 Switch Setup According to Illumination and Subject

Various switch settings are performed to accommodate the conditions of the illumination and the subject when shooting.

GAIN SWITCHING
GAIN switch
AUTO IRISFULL AUTO BLACK				LOLUX
	BACK L		STRETCH
	NORMAL		NORMAL
	SPOT L		COMPRESS
	GAIN	OUTPUT		WHT.BAL
VTR
	NG	OPERATE
		ON		OFF

CAUTION: When gain is set to "ALC", gain is boosted automatically as the illumination becomes darker. However, noise will

This switch allows the gain to be boosted when the illumination
of the subject is insufficient.
Switch Position	Factory-Set Gain
L	0dB
M	9dB
H	18dB
When the GAIN switch is switched, the newly set gain is
displayed for about 2 seconds on the Status 0 or Status 1 screen
in the viewfinder.
Set it to L (0 dB) in normal use.

The gain set for each of the switch positions can be changed with "GAIN" on the OPERATION MENU screen.

It is also possible to use the ALC function that varies the gain automatically.

☞See page 79 for details.

To make the gain transition smoother, set “SMOOTH TRANS” on the OPERATION MENU to “ON”.

☞See page 79.

SWITCH FUNCTIONS
AUTO IRIS LEVEL		BLACK stretch/black
switch		compress setting switch
AUTO IRISFULL AUTO BLACK				LOLUX
	BACK L	STRETCH
	NORMAL	NORMAL
	SPOT L	COMPRESS
	GAIN	OUTPUT	WHT.BAL
VTR
	NG	OPERATE
		ON		OFF

1AUTO IRIS LEVEL switch

This switch allows the reference value for the auto iris adjustment to be changed according to the lighting condition. BACK. L : When the subject is in backlit conditions. Opens the iris wider than the standard setting. NORMAL: Normal lighting condition. SPOT. L : When the subject is under a spotlight. Closes the iris narrower than the standard setting.

The level of auto iris can be set in SPOT L/BACK L of the Camera OPERATION menu screen when setting the AUTO IRIS switch to BACK L or SPOT L. ☞ See page 79.

2BLACK stretch/black compress switch
This switch makes the image easier to see by varying the
black gain.
BLACK STRETCH	: Boosts the gain of black areas to
	improve the reproducibility of black.
NORMAL	: Normal black gain.
BLACK COMPRESS : Attenuates the gain of black areas to
	make the image sharper.

increase a little because the screen becomes brighter as the ALC (Auto Level Control) function boosts the gain more than in the case of manual adjustment.

However, note that the SMOOTH TRANS function is not available if gain is set to ALC.

FULL AUTO SHOOTING (FAS) FUNCTION

GAIN BOOST UNDER LOLUX CONDITION

FULL AUTO	FULL AUTO\
indicator	shooting button

The FAS function provides a wide range of compatibility with shooting conditions that varies as you move between indoors and outdoors or between bright and dark locations. It eliminates the need to change the switch and filter positions every time you move.

		LOLUX on/off button
AUTO IRIS	FULL AUTO	BLACK		LOLUX
	BACK L		STRETCH
	NORMAL		NORMAL
	SPOT L		COMPRESS
	GAIN	OUTPUT		WHT.BAL
VTR
	NG	OPERATE
	ON			OFF

The LOLUX button is used when the illumination is still insufficient after compensating with the GAIN switch. Press the button to enter the LOLUX mode in which the gain is boosted by about 33 dB. "LOLUX ON" is displayed for about 2 seconds on the Status 0 or Status 1 mode screen in the viewfinder. Pressing the button again cancels the LOLUX mode. "LOLUX OFF" is displayed for a few seconds.

When the LOLUX function is in use, the image definition on the screen will degrade to increase residual images, but this is not a malfunction.

AUTO IRIS	FULL AUTO	BLACK		LOLUX
	BACK L		STRETCH
	NORMAL		NORMAL
	SPOT L		COMPRESS
	GAIN	OUTPUT		WHT.BAL
VTR
	NG	OPERATE
	ON			OFF

The FAS function provides an integrated control of the ALC (Automatic Level Control), Auto iris and FAW (Full-time Auto White balance) functions.

Operation
1.	Simply press the FULL AUTO button to enter the FAS mode,
	in which the FULL AUTO indicator lights and "FAS" is
	displayed to the right in the viewfinder.
2.	Pressing the FULL AUTO button again cancels the FAS
	mode and turns the FULL AUTO indicator off.

Automatic Setting Contents

[Relationship between gain, iris and shutter]
0.7 Ix	8 Ix		32 Ix		2000 Ix	4200 Ix	18000 Ix
33 dB				FULL AUTO SHOOTING		1/50	1/200	(E MODEL)
	12dB
			0 dB
						1/60	1/240	(U MODEL)
LOLUX		ALC		AUTOMATIC IRIS			EEI
			F1.4		F11	F16

CAUTION:

•The FAS function will not operate during external video signal input.

•When the power is turned on while the camera is in the FAS mode, it takes about 10 seconds before the automatic adjustment of FAS is completed.

•In the FAS mode, the audio recording level is not set automatically to the AUTO mode.

To select the AUTO mode, set the AUTO/MANUAL switch of the VCR section to AUTO.

•If you have been displaying the color bars, the screen is switched automatically to the camera image.

•The auto iris adjustment mode is entered even if the iris mode switch of the lens is set to manual.

•The GAIN switch and WHT.BAL switch settings are defeated in the FAS mode.

•The LOLUX button setting is active even in the FAS mode. However, the ALC and EEI are defeated in the LOLUX mode, in which only the auto iris adjustment and FAW are used.

•All of the previous setting contents are recalled when the FAS mode is cancelled.

•The SMOOTH TRANS function is defeated during switch to

the FAS function.

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