- With This Adapter, You Can used Contax Rangefinder CRF RF Lens on Leica Mount SM M39 L39 camera body. - Although the lens will fit physically, automatic diaphragm, auto-focusing, or any other functions will not operate correctly while using this adapter. - Infinity focus is guaranteed. - Adapter has manual focus ring. but can not linkage focusing. - Made of aluminum. - Lens lock / release and stop screw. - Fine finishing! Install, remove and operate lens smoothly! Suitable for: - Lens: Contax Rangefinder CRF RF Lens,(inside bayonet, See the picture) - Cameras: Leica SM M39 L39 Mount Camera Package - 1 x Lens adapter.