High performance, large aperture medium telephoto macro lens incorporating Sigmas Optical Stabiliser function.Sigmas medium telephoto macro lens incorporates Optical Stabilisation allowing the use of shutter speeds approximately 4 stops slower than would otherwise be possible. SLD glass provides good control of aberration and the floating inner focus system ensures high rendering throughout the focusing range. By using Sigmas APO Tele Converters, it is possible to take photos at greater than 1:1 magnification. HSM ensures a quiet and high speed AF as well as full-time manual focus override. This lens has a rounded 9 blades diaphragm which creates an attractive blur to the out of focus areas. Large aperture medium telephoto macro lens This medium telephoto macro lens allows you to maintain an appropriate distance from subjects while still getting close up photos. Since the working distance at its closest focusing position is 142mm, shadows of the lens and camera will not affect photogra