The Sigma 20mm f1.4 DG HSM A full frame Lens for Nikon DSLR cameras delivers outstanding large-aperture brightness and bokeh, offering unprecedented visual experiences. This lens is ideal not only for such ultra-wide-angle subjects as landscapes and starry skies, but also for snapshots in low light, indoor photography, portraits with a natural bokeh effect, and much more. The world's first f/1.4 20mm lens for full frame DSLRs. Part of SIGMA's ART range of lenses. Aperture Range: f/1.4 to f/16. Rounded 9-Blade Diaphragm. Features FLD, SLD and Aspherical glass elements. Hypersonic AF for high speed and silent autofocus. Made in Japan. This Sigma 20mm f1.4 DG HSM Art Lens makes a stunning and versatile addition to the Sigma Art series lenses. It can be used for travel, landscapes, weddings & events and even wildlife. It offers an ultra-wide angle of view with a large and very fast f1.4 aperture. Equally, the speed and aperture of this lens makes it well-suited for handheld, lowlight shooting.