High performance large aperture medium telephoto macro lens with os optical stabilizer 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 converter it is possible to take photos at greater than 11 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