Sigma's 24mm F1.8 EX DG Aspherical Macro lens is a large aperture wide angle lens giving photographers freedom of expression with the ability to set the desired aperture and get as close as 7.1 inches allowing the photographer the juxtaposition between near and backgrounds in the distance. The 84 angle of view is perfect for landscape photos while also great for shooting group shots without distorting the subjects at the edge of the frame and compact enough for working in tight quarter with a single subject. This lens is perfect for photo journalists where it is essential to have a fast, wide angle lens, scenic, social and full-time professional photographers who are in need of a hardworking lens. Extremely compact within the category of super fast wide-angle lenses and totally affordable for the professional as well as aspiring professional and student photographers! Features Extremely compact with a length of 3.36 inches and a weight of a little over one pound A lens hood, front/rear lens cap and carrying case are included with the lensSpecifications Lens Construction - 10 Elements in 9 Groups Angle of View - 84.1 Number of Diaphragm Blades - 9 Minimum Aperture - f22 Minimum Focusing Distance - 18 cm / 7.1 in. Filter Size (mm) - 77mm Maximum Magnifications - 1 - 2.7 Corresponding Mounts - Nikon (ASP, EX, DG, D) Dimensions (Diameter x Length) - 83 x 80 mm / 3.3 x 3.1 in. Extended Dimensions - 85 mm / 3.3 in. Weight - 485 g / 17.1 oz.