LG LS903 Instruction Manual page 16

Concerning Auto-Iris Lenses
VIDEO type auto-iris lens
A lens with amplifier circuit that operates on video sig-
nal and DC power source. In general, this type of lens
is referred to as EE amplifier type lens.
ALC and LEVEL volume level controls are available
on the lens for iris adjustments. (Set the ALC Lens
Setting Switch to the VIDEO position.)
CAUTION:
Be cautions not to use Auto Iris Lens with over 35mA.
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