A breech-lock is a system for mounting camera lenses to camera bodies.
The lens is attached to the camera by means of a rotating ring which is used to tighten the lens to the camera by friction.
With breech-lock, the body of the lens does not rotate relative to the camera body, whereas with bayonet or screw mounts, the lens is rotated into place.
[2] Breech-lock comes from the mechanisms that lock closed the breech of breech-loading firearms and artillery.
[3] This photography-related article is a stub.