Wikipedia
A lens mount is an interface — mechanical and often also electrical — between a photographic camera body and a lens. It is confined to cameras where the body allows interchangeable lenses, most usually the rangefinder camera, single lens reflex type or any movie camera of 16 mm or higher gauge. Lens mounts are also used to connect optical components in instrumentation that may not involve a camera, such as the modular components used in optical laboratory prototyping which join via C-mount or T-mount elements.
Usage examples of "lens mount".
An aluminum brace reinforced the assembly of the heavy lens and the camera, preventing the weight of the lens, electronics and battery from snapping the lens mount.
It was a popular make with a type of lens mount that permitted fast switching of lenses.