Versatile Ultra-Wide Zoom. The Sigma 10-18mm f/2.8 DC DN Contemporary’s ultra-wide 15-27mm equivalent zoom range and compact build make it great for travel photography, family photography, and vlogging, while its fast constant f/2.8 maximum aperture and rounded seven-blade diaphragm produce round, pleasing bokeh and enable excellent performance in low light.

High-Quality Optical Formula. As a part of Sigma’s Contemporary lens line, the 10-18mm f/2.8 goes through rigorous testing to ensure high image quality. Its ten-group/thirteen-element optical design features three “F” Low-Dispersion elements, one Super Low-Dispersion element, and four aspherical elements that correct for chromatic aberrations and color fringing while ensuring high image sharpness, clarity, and contrast throughout the zoom range. A Super Multi-Layer coating minimizes lens flare and ghosting, helping to provide high contrast even in strong lighting.

Fast, Quiet Autofocus System. The 10-18mm’s integrated stepping autofocus motor provides fast, quiet operation in a broad range of shooting situations, and its optimized AF algorithm helps facilitate smooth performance. You can also manually override the autofocus motor at any time by rotating the focusing ring, giving you quick fine-tuning ability. You get a 4.6-inch minimum focusing distance with a 1:4 maximum magnification ratio. This lens was built to minimize focus breathing, and its internal-focusing design means it maintains its length during focusing.