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C- Cs

C-Mount

Standardized interface for the mounting of lenses, described in ISO 10935 (1996-12) Optics and optical instruments – Microscopes – Interface Type C

Standard interface for mounting of lenses.
The diameter of the thread is 1 “(one inch) and there are 32 threads to 1” in length.
The distance between the mechanical stop of the lens and the sensor in air is 17,526 mm

This is about 5mm more than for CS-mount lenses. C-mount lenses can be used with a 5mm extension ring (“C- to CS-mount adapter”) with CS-mount cameras.
CS-mount lenses however can not be used with C-mount cameras.

C-mount lenses are usually used for factory automation lenses.

CS-Mount

Standardized interface for the mounting of lenses, described in ISO 10935 (1996-12) Optics and optical instruments – Microscopes – Interface Type CS

The diameter of the thread is 1 “(one inch) and there are 32 threads to 1” in length.

The distance between the mechanical stop of the lens and the sensor in cross bolts in air is 12.52 mm. These are about 5mm less than for C-mount lenses.

C-mount lenses can (with an 5mm extension (C-CS-mount adapter))  be used in CS-mount cameras,

However CS mount lenses can not be used in C-mount cameras.
CS-Mount lenses are mostly used in security systems, often these are wide-angle lenses.