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This super-wide-angle lens has large, fast f/1.8 aperture and incorporates Sigma's Super Multi Coating to reduce the flare and ghosting that is common when using digital SLR cameras. Aspherical lens elements in both the front and rear lens groups effectively compensates for distortion, spherical aberration and astigmatism.
A minimum focusing distance of 7.9" along with a maximum magnification of 1:4 and a wide 94.5 degree angle of view make this an ideal lens for close up photography. The iris diaphragm has 9 diaphragm blades enabling you to obtain beautiful out of focus images in the foreground and background. The Dual-Focus (DF) mechanism uses a rear focus system, eliminating the need for the front of the lens to rotate during auto-focus. The wide, textured, rubberized focus ring conveniently moves forward to click into AF position and back to select manual focusing.
