The Nikon F-mount 14mm f/1.8 DG HSM from Sigma is a unique wide-angle prime designed to produce high-resolution, well-corrected imagery. As part of the Art line of lenses, this lens has a focus on image quality and rendering and utilizes both FLD and SLD glass elements to control chromatic aberrations and color fringing for notable clarity. Four aspherical elements, including the front large-diameter precision-molded glass element, also contribute to reducing distortion and spherical aberrations for improved sharpness and accuracy. Additionally, a Super Multi-Layer Coating has been applied to individual elements to suppress lens flare and ghosting for greater contrast when working in strong lighting. This focusing motor also enables full-time manual focus override at any time just by rotating the focus ring for refined manual control and focusing as close as 10.6". The lens barrel is constructed using a Thermally Stable Composite material, which supports working in a wide variety of temperatures and conditions, and the lens mount is constructed from brass for long-term durability and mounting accuracy. Additionally, this lens is also compatible with the optional Sigma USB Dock for fine-tuned control over focusing parameters and other lens characteristics. A prime wide-angle lens is designed for FX-format Nikon F-mount DSLRs, however, it can also be used on DX models where it will provide a 21mm equivalent focal length. Three F Low Dispersion (FLD) and four Special Low Dispersion (SLD) elements are featured in the optical design and help to reduce color fringing and chromatic aberrations for improved clarity and color accuracy. A Super Multi-Layer Coating has been applied to lens elements in order to minimize lens flare and ghosting and contribute to producing contrast-rich and color-neutral imagery, even in backlit conditions. The HSM also permits full-time manual focus control simply by rotating the focus ring at any time. The bayonet mount is constructed from brass for ensured accuracy and durability. Additionally, rubber sealing is incorporated in the mount design to render it dust- and splash-resistant.