Security Cameras 101 -- Info Guide to Security Cams, CCTV & Video Surveillance

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C-Mount Camera

The lens can be changed out in a C-mount camera, which is its versatility. C-mount camera lenses are available from 4mm - 50mm. A 4mm lens lets you see out to about 35 feet.

There are two types of cmount cameras and they differ in the flange-back distance. Flange-back distance is measured from the focal plane of the lens back to the flange of the lens. C-mount lenses have a flangeback of 17.5mm while CS-mount lenses have a flange-back distance of 12.5mm.