Concerning Auto-Iris Lenses
DC type auto-iris lens
A lens without driver circuit that operates only on a DC power source. In general, this type of lens is referred to as DC type coil lens. (Set the ALC Lens Setting Switch to the DC position.)
VIDEO type auto-iris lens
A lens with amplifier circuit that operates on video signal 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 50mA.
ELC type auto-iris lens
Use a manual or fixed iris lens (Set the ALC Lens Setting Switch to the ELC position.)
If using a VIDEO type auto-iris lens
•Set the ALC and LEVEL controls on the lens to adjust the iris. Normally the ALC volume should be turned all the way to Av (Average).
•Depending on the type of lens used, the lens may not perform properly. In such a case, adjust the LEVEL volume on the lens casing to correct.
Pin layout for the lens iris output connector
No. | DC type lenses | VIDEO type lenses |
1 | Damp - | Vcc (+12V) |
2 | Damp + | Not used |
3 | Drive + | Video |
4 | Drive - | Ground |
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