S-mount (CCTV lens)

The S-mount is a standard lens mount used in various surveillance CCTV cameras and webcams.

Because the lens mounts are usually attached directly to the PCB of the sensor, they are often called "board lenses".

S-mount lenses do not have a flange and therefore there is no fixed lens to sensor distance and they must be adjusted to focus.

[2] Due to the small size of the lens barrel, performance is somewhat limited compared to larger lenses[3] and most S-mount lenses are relatively slow (f/1.6 and slower).

High-end CCTV cameras generally use C- or CS-mount lenses, where much faster apertures like f/1.0 are common.