About ALC and EEI operations
ALC refers to Automatic Level Control and EEI refers to shutter iris control.
The Automatic Level Control (ALC) operates under dark lighting and the electronic shutter (EEI) operates under bright lighting. Furthermore, setting the IRIS mode to AUTO will synchronize sensitivity, iris and electronic shutter and appropriate signal level can be acquired automatically at all times.
The ALC mode increases sensitivity from 0dB (ISO100) to +12dB (ISO400) under dark lighting and the EEI mode automatically adjusts the electronic shutter within the range of 1/7.5 to 1/
255.1(calculated value) when in FINE under bright lighting (1/30.2 to 1/255.1 for DRAFT). In other words, the signal level is adjusted in the range of 2 graduations of the aperture under dark lighting and 5 graduations when in FINE under bright lighting. When the iris is set to manual, the sensitivity and electronic shutter are continuously changed without changing the iris setting.
This feature holds the advantage of being able to record under changing light conditions without changing the depth of field.
Operational range
Light 1×
| 16 | 32 | 62.5 | 125 | - | - | - | 250 | 500 | 1000 | 2000 | 4000 | 8000 | 16000 | 32000 |
FINE | ALC |
|
|
ISO400 ISO200
EEI
1/15 1/30 1/60 1/120 1/240
F1.4 F2 F2.8 F4 F5.6 F8 F11 F16
DRAFT | ALC |
|
|
ISO400 ISO200
EEI
1/60 1/120 1/240
F1.4 F2 F2.8 F4 F5.6 F8 F11 F12
