After purchasing this lens, I bought a camera from another manufacturer, so I haven't used it much and it's in beautiful condition. The box is slightly crushed, but there are no problems with the lens or lens hood (see image 4). The SIGMA 16mm F1.4 DC DN | Contemporary is the first interchangeable lens for Sony E-mount APS-C mirrorless cameras to achieve a 24mm F1.4 equivalent in 35mm format (32mm F1.4 equivalent in 35mm format for Micro Four Thirds). This is a wide-angle lens with a large aperture that mirrorless camera users have been waiting for. SIGMA's interchangeable lenses for mirrorless cameras are based on the concept of adopting a lightweight and compact package that is easy to use in everyday life, and have been designed with focal lengths that cover the basic composition of photography. The 30mm F1.4 DC DN | Contemporary, released in 2016, was the first in a new series of large-aperture single-focus lenses for mirrorless cameras that achieve high optical performance while maintaining an F1.4 brightness. This 16mm F1.4 DC DN | Contemporary was developed under the same concept as the 30mm F1.4 DC DN | Contemporary. With a lens configuration of 13 groups and 16 elements, it uses a large number of special glass elements. It suppresses various aberrations and achieves high resolution from the wide-open aperture. In addition, the optical design and the adoption of a stepping motor that supports video AF allow for natural focus work with autofocus. It also features a simple dust- and splash-proof structure, including sealing at the mount. Size: α E-mount Focal length: 13-18mm Maximum aperture: ~1.4