What is the difference between DC auto iris and Video auto iris lenses?
The latter can be with built-in amplifier (so called video drive) or without amplifier (DC drive). 1.Video drive lens operates by the camera video output signal. It can be easily recognized because , comparing with DC drive, it has a 3 wires connection (video, power, ground). Its operation can be controlled by ALC and level potentiometers. The connector to the camera is normally not supplied with lens, because there is no internationally recognized standard on it and every single camera manufacturer can have a different standard. 2.DC Drive lens operates with 2 coils: driving coil is to move the open/close iris operation while damping coil is used to break iris movement (consider it as a reaction to driving coil operation), thus controlling the stability of iris movement. This lens has a 4 wires connection. Connector can be supplied with lens being a standard on most cameras. This lens is cheaper than the video drive type, lacking the built-in amplifier which is incorporated into the c
