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kuocyj - 02 Apr 2007, 07:50 pm
What's VC lens and DC lens? what's difference between these two types lens? Thank you so much for your help.
Security Cameras
»question about auto iris lens
( >> )survtech - 02 Apr 2007, 07:59 pm
The difference is what signal the lens requires for the iris control. Video auto-iris lenses sample the video signal from the camera and convert it to a DC signal in the lens to adjust the iris accordingly. With DC auto-iris lenses, the camera has the circuitry that converts the video signal to a DC voltage that the lens uses to adjust the iris.
DC auto-iris lenses are simpler (and therefore cheaper). Most modern cameras use DC auto-iris lenses. Some cameras can use either and will have a switch to select the type of A-I lens.
DC auto-iris lenses are simpler (and therefore cheaper). Most modern cameras use DC auto-iris lenses. Some cameras can use either and will have a switch to select the type of A-I lens.