How to judge whether it is C port or CS interface?

C mounting seat and C S mounting seat. The threads are the same, but the distance between the lens and the photosensitive surface is different.

C mounting seat: The distance from the lens mounting datum to the focus is 17.526 mm. CS mounting seat: The distance from the base level of lens mounting to the focus is 12.5mm.

C-port lens

C-port lens is generally divided into manual lens and automatic lens: manual lens is focused, zoom, aperture size is controlled manually; automatic lens is the first three can be controlled by themselves. Broadly speaking, it includes TV lens, camera lens, cinema lens, surveillance gun lens, camera and so on.

The Difference between CS Lens and CR Interface Lens

The most obvious difference between C-Mount lens and CS-Mount lens is the distance between the lens and the camera to the position (focal plane) of the camera's photosensitive component (CCD/COMS sensor). This distance professional term is called flange focal length, C interface flange focal length is 17.5mm, CS interface flange focal length is 12.5mm. Both lenses belong to threaded interfaces.

In the process of lens use, the C-type standard camera is usually connected with the C-interface lens, and the CS-type camera is connected with the CS-type camera. But in the process of using, the C-interface lens can be equipped with a 5 mm thick extension ring to match with the CS camera, while the CS lens and the C camera can not match.

C interface lens without extension circle will lead to lens touching sensor target, resulting in sensor damage. The reason why CS lens can not be combined with C-type camera is that the lens imaging surface is too far away from the CCD receiving surface to obtain the focused image.