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Optimized image quality for Digital SLR cameras. Floating Internal Focusing (FIF) system minimizes the aberration in entire focusing range. Super Multi Layer (SML) coating reduces the ghost caused by reflections from the surface of digital image sensors. Minimum aperture of F/45 provides greater depth of field (F45 for Sigma, Canon and Konica Minolta mounts and F32 for Nikon and Pentax mounts). A screw-in hood for convenient use of circular polarizing filters Sigma Corporation is pleased to announce the launch of the new MACRO 50mm F2.8 EX DG lens. MACRO 50mm F2.8 EX DG incorporates the very latest optical technology and is an ideal standard lens for digital SLR cameras. The new advanced lens design corrects various aberrations. This macro lens is specially coated to get the best color balance whilst cutting down ghost caused by reflections from the digital image sensor. This lens provides the utmost correction against lateral chromatic aberration, which is a serious problem for digital SLR cameras. The new MACRO 50mm F2.8 EX DG incorporates a ''Floating Internal Focusing'' (FIF) system which enables this lens to photograph objects precisely not only at life-size reproduction but also at infinity. The lens has a minimum focusing distance of 18.9cm (7.4 in) and is capable of true macro photography with a maximum magnification of 1: 1. Experience the enjoyment of real life-size macro photography. This lens is equipped with a ''Focus Limiter Switch'' that limits the auto focus range, allowing the camera focus more quickly. This lens has a minimum aperture of F45 (for Sigma, Canon and Konica Minolta mounts), which produces a tremendous depth of field. A screw-in hood is included, for convenient use of circular polarizing filters. It is also possible to attach a 72mm filter in front of the lens hood.