JVC KY-F70B manual Others, About ALC and EEI operations, E70

8. Others

About ALC and EEI operations

ALC stands for Automatic Level Control and EEI for Extended Electronic Iris. (
page 51, 52) By making the respective settings, the Automatic Level Control (ALC) will operate under dark lighting, and the electronic shutter (EEI) will operate under bright lighting. Furthermore, setting the IRIS mode to AUTO will synchronize sensitivity, iris and electronic shutter so that an appro- priate 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 s to 1/2384.7 s (calculated value) when in FINE under bright lighting (1/30.2 s to 1/2384.7 s for DRAFT). In other words, the signal level is adjusted in the range of 2 graduations of the aperture under dark lighting and 8 graduations when in FINE under bright lighting (6 graduations in DRAFT). When the IRIS mode is set to manual, the sensitivity and electronic shutter change continuously whilst the iris setting stays fixed. (
page 50 IRIS MODE)

This feature holds the advantage of being able to record under changing light conditions without the depth of field altering.

MEMO

•The status of ALC and EEI can be displayed on the screen. (
page 57 ON SCREEN)

•When EEI is used, the amount of change in one step of the signal level will be large and the precision becomes bad as the shutter speed is faster.

Operational range

Light: lx

4

8

16

31

63

125

250

500

1000 2000 4000 8000 16000 32000 64000

											640000
	ISO100					1/7.5
FINE	ALC							EEI
ISO400	ISO200						1/15	1/30	1/60	1/120	1/2384.7
	F2.8	F4	F5.6	F8	F11	F16
			ISO100					1/30.2
	DRAFT	ALC							EEI
									1/60	1/120	1/2384.7
	ISO400	ISO200
			F2.8	F4	F5.6	F8	F11	F12

E70