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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
ALC
FINE
ISO400 ISO200
DRAFT
-
-
F1.4
F2
F2.8
F4
ALC
ISO400 ISO200
F1.4
F2
-
250
500 1000 2000 4000 8000
F5.6
F8
F11
F16
F2.8
F4
F5.6
F8
16000
32000
EEI
1/15
1/30
1/60
1/120 1/240
EEI
1/60
1/120 1/240
F11
F12
E43
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