JVC GY-DV5100 Gain Sensitivity Adjustment, Switch Setup According to Illumination and Subject

12. FEATURES OF THE CAMERA SECTION

12-5 Gain (Sensitivity) Adjustment

The gain should be switched when the brightness is insufficient due to poor lighting conditions.

12. FEATURES OF THE CAMERA SECTION

12-6 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 IRIS	FULL AUTO	BLACK		LOLUX
	BACK L		STRETCH	MODE
				VTR
	NORMAL		NORMAL

SPOT L

CAM

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

SWITCH FUNCTIONS

AUTO IRIS	BLACK stretch/black
LEVEL switch	compress switch
AUTO IRIS	FULL AUTOBLACK		LOLUX
BACK L		STRETCH	MODE
			VTR
NORMAL		NORMAL
SPOT L			CAM

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.

POWER VTR

ONOFF

CAUTION:

When gain is set to “ALC”, gain is boosted automatically as the illumination becomes darker. However, noise will increase a little because the screen becomes brighter as

When the GAIN switch is switched, the newly set gain is displayed for about 3 seconds on the Status (0, 1, 3) screen in the viewfinder or LCD monitor.

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 CAMERA OPERATION menu screen.

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

automatically.

A setting at –3dB corresponds to a decreased sensitivity

equivalent to the brightness of a 1/2 filter.

☞ See page 75 for details.

■ The gain transition can be made smoother by selecting

“SMOOTH TRANS” on the CAMERA OPERATION menu

POWER	VTR
ON	OFF

■The level of auto iris can be set in SPOT L/BACK L on the CAMERA OPERATION menu screen when the AUTO IRIS switch is set to BACK L or SPOT L. ☞ See page 75.

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.

the ALC (Auto Level Control) function boosts the gain more than in the case of manual adjustment.

screen.

☞ See page 75.

FULL AUTO SHOOTING (FAS) FUNCTION

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

FULL AUTO indicator

FULL AUTO/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

GAIN BOOST UNDER LOLUX CONDITION

AUTO IRIS

BACK L

NORMAL

SPOT L

FULL AUTO

BLACK		LOLUX
	STRETCH	MODE
		VTR
	NORMAL

you move.

The FAS function provides an integrated control of the ALC

LOLUX on/off button

The LOLUX button is used when the illumination is still insufficient after compensating with the GAIN switch. Pressing the LOLUX button again will enter the LOLUX mode. The gain up value during the LOLUX mode is set in LOLUX

CAM

(Automatic Level Control), Auto iris and FAW (Full-time Auto White balance) functions.

AUTO IRIS	FULL AUTO	BLACK		LOLUX
	BACK L		STRETCH	MODE
				VTR
	NORMAL		NORMAL

SPOT L

CAM

POWER VTR

ONOFF

GAIN of the CAMERA OPERATION menu.

“LOLUX ON” is displayed for about 3 seconds on the Status (0, 1, 3) mode screen in the viewfinder or LCD monitor. Pressing the button again cancels the LOLUX mode. “LOLUX OFF” is displayed for about 3 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.

POWER VTR

ONOFF

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 or LCD monitor.

2.Pressing the FULL AUTO button again cancels the FAS mode and turns the FULL AUTO indicator off.

CAUTION:

■Automatic Setting Contents

● 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.

Relationship between gain, iris and shutter

0.2 Lx		8 Lx		32 Lx		2000 Lx		4200 Lx	18000 Lx
					FULL AUTO SHOOTING
36 dB		12dB		0 dB				1/60	1/240
	LOLUX		ALC		AUTOMATIC IRIS				EEI
				F1.4			F11	F16

●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.

● 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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