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The Sigma 20-40mm F2.8 EX DG lens is a joy to use. The Sigma 20-40mm lens has good build quality and feels solid in the hand. The Sigma 20-40mm F2.8 EX DG lens is a new addition to the Sigma range. Providing a continuous maximum aperture of f/2.8 between the minimum and maximum focal lengths the Sigma 20-40mm has a minimum focusing distance of 30cm throughout the range and the maximum magnification ratio is 1:4.6.. The Sigma 20-40mm F2.8 EX DG is a new lens with F2.8 throughout its zoom range, from ultra-wide 94.5 degrees to near-standard 56.8 degrees angle of view, for photographers to shoot more creatively from various angles and zoom perspectives. With a fast F2.8 maximum aperture superior peripheral brightness is ensured. This Sigma 20-40mm lens is perfectly suited for indoor shootings even in dim light without worrying about blurring in photos. Among the practical high-performance features of the lens are DF (Dual Focus) mechanism for optimal handling stability during autofocus operation; a wider-than-conventional focal ring for superior manual focusing operation; and an inner focusing system that eliminates front lens rotation during focusing, and allows use of the standard petal-type hood accessory, which is excellent at blocking out extraneous light. These features also make this lens desirable for use with Digital SLR Cameras. Sigma 20-40mm F2.8 EX DG key features: 30cm minimum focusing distance throughout the zoom range. Aspherical lens compensates for aberration. Sophisticated, yet simple to use. see the Sigma 20-40mm F2.8 EX DG and full range here