JVC GY-DV5000 manual Gain Sensitivity Adjustment, Relationship between gain, iris and shutter

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.

GAIN SWITCHING

GAIN switch

AUTO IRISFULL AUTO BLACKLOLUX

MODE

BACK L	STRETCH	VTR
NORMAL	NORMAL
SPOT L	COMPRESS	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

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

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 71 for details.

■The gain transition can be made smoother by selecting “SMOOTH TRANS” on the CAMERA OPERATION menu screen.

☞See page 71.

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

GAIN BOOST UNDER LOLUX CONDITION

LOLUX on/off button

AUTO IRIS FULL AUTO BLACK LOLUX

BACK L	STRETCH	MODE
		VTR
NORMAL	NORMAL
SPOT L	COMPRESS	CAM

POWER VTR

ON OFF

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 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.

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				1/50	1/200
	LOLUX		ALC		AUTOMATIC IRIS				EEI
				F1.4			F11	F16

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