SONY ULTRA WIDE CONVERTER VCL-ECU1 Sony Ultra Wide Converter Lens E-mount For APS-C, Single-focus 16mm F2.8 (SEL16F28) and Wide converter lens Sold as a set. Includes lens case. Can be used as a wide-angle lens with a fisheye effect. You can also use it as a single-focus lens by removing the converter. Operation confirmed. Used about 10 times and is relatively clean, but it is a used item that has been stored for a long time, so please understand before purchasing. Focal length: 13-18mm Open F value: 2.1-2.8 Front lens cap and lens case included. Sony Model Name: E16mm F2.8