This function electrically boosts the light sensitivity when there is insufficient illumination on the object. You can set the gain of the video amplifier according to the brightness of the object. Select the setting mode according to your shooting conditions.
Setting the Gain
TOP
Manual Gain Mode (Manual Gain Switching)
Press the [GAIN] button to set to the Manual Gain mode.
The 
icon on the screen disappears.
Use the [L/M/H] switch to set the gain of the selected video amplifier.
The default positions of the switch are as follows.
[L]:
0dB
[M]:
6dB
[H]:
12dB
Memo
You can change the gain value of each position in the menu. Increasing the sensitivity causes the screen to appear grainier.
Automatic Gain Mode (Automatic Gain Adjustment)
Set the [FULL AUTO] switch to “ON”.
The icon appears on the screen.
Memo
Set the [FULL AUTO] switch on the camera recorder to “ON” to enter the Automatic Gain mode ([ALC] fixed). The gain of the video amplifier is automatically set according to the brightness of the object.
In this case, the [GAIN] switch on the camera recorder is disabled.
Memo
The upper limit of the gain setting value during ALC operation can be set in [Main Menu] 
[Camera Function] [ALC Limit].