Ernst Leitz Wetzlar Elmar lens, 9cm focal length, maximum aperture f/1.4, 49mm filter thread. - Brand: Ernst Leitz Wetzlar - Model Name: Elmar - Focal Length: 9cm - Maximum Aperture: f/1.4 - Filter Thread: 49mm Thank you for viewing. The exterior condition is poor, but the lens is clean and I believe it is usable. For convenience, it is mounted on an αE mount, but it is a screw mount. The yellow filter is used as a lens cap, and the one below is a protective filter. Furthermore, an M-mount adapter is also included.