Sigma 70-300mm F4-5.6 APO DG MACRO Telephoto zoom lenses with tele-macro function, optimized for digital cameras. The high performance telephoto zoom lens is ideal for digital SLR cameras. This lens has two SLD glass elements in the front lens group and one in the rear lens group It is able to shoot with maximum magnification 1:2 at the focal length of 300 mm. It’s the ideal lens for portraits, sports photography, nature photography, and other types of photography that frequently use the telephoto range. New coating reduces Ghost and Flare. The new multi layer lens coating and lens design reduce flare and ghost, which is a common problem with digital cameras and also creates an optimum color balance through the entire zoom range. It is equipped with three pieces of SLD glass for high image quality This lens has two SLD (Special Low Dispersion) glass elements in the front lens group and one in the rear lens group, the lens has excellent correction of chromatic aberration through the entire zoom range. Macro shooting with maximum magnification 1:2 High optical performance is demonstrated throughout the entire zoom range. It also has a switch that converts the lens to macro photography at focal lengths between 200mm and 300mm with a minimum focusing distance of 95cm (37.4 inches). In normal mode the minimum focusing distance is 150cm (59.1 inches) at all zoom settings. Maximum magnification between 200mm and 300mm is 1:2.9 to 1:2. Lens Construction 14 Elements in 10 Groups Angle of View 34.3 - 8.2 degrees Number of Diaphragm Blades 9 Blades Minimum ApertureF22 Minimum Focusing Distance 150cm / (95cm Macro mode) 59.1 in. / (37.4 in. Macro mode) Maximum Magnification 1:4.1 / 1:2(Macro mode) Filter Size Diameter 58mm Dimensions Diameter 76.6mm X Length 122mm 3.0 in. X 4.8 in. Weight550g/19.4 oz. Corresponding AF Mounts SIGMA, CANON, NIKON (D), MINOLTA, PENTAX