Sigma 18-35mm f/1.8 DC HSM Art lens is suitable for a wide variety of situations, including travel, portraiture, wedding and events, general family photography, reportage, and photojournalism12. It offers a fast constant aperture (f/1.8) that’s practically unheard of in similar zoom lenses1. The lens allows the use of lower ISO settings in low light and offers the depth-of-field equivalent of a constant F2.7 on full-frame3. It uses Sigma's Hypersonic Motor for fast, silent focusing, and is compatible with the Sigma USB dock for fine-tuning autofocus calibration3. It can be used for low light pictures of available light in rooms or for astro photography, and is also suitable for landscape photography4.