The Leica Lens Holder M allows you to keep a complete mini photo outfit - a camera and two lenses - hanging on your carrying strap and ready for use. The holder is screwed into the camera's tripod bushing, and then a second lens can be attached to the holder's bayonet mount. The lens can serve as a handle helping to provide additional stability when shooting handheld at long exposure times. The setup could even be used as a miniature tripod. The M system lens holder fits all Leica M models except the Leica M5.