What is "s-mount"

The S-mount is a standard lens mount used in various surveillance CCTV cameras and webcams. It uses a male metric M12 thread with 0.5 mm pitch on the lens and a corresponding female thread on the lens mount; thus an S-mount lens is sometimes called an "M12 lens". Because the lens mounts are usually attached directly to the PCB of the sensor, the standard is often called "board lens". The supported sensor formats range from the smallest 1/6-inch type to the largest 1/3-inch having an 11mm diagonal sensor. The lens mount is usually made of plastic and the lenses lack an iris control. 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.

S-mount may refer to:

• Kodak S-mount, a combined bayonet and thread lens mount for ciné lenses and cameras between 1948 and 1961
• Nikon S-mount, a dual-bayonet lens mount used for a range of Nikon rangefinder cameras between 1948 and 2005
• Leica S-mount, a fully electronic bayonet lens mount used for Leica medium-format SLRs such as the S2 since 2008
• S-mount (CCTV lens), a threaded lens mount for CCTV lenses and webcams