This Sigma macro lens offers a 180 mm focal length and 1:1 magnification ratio. The high-speed f/2.8 lens offers a fast shutter system and original, integrated Optical Stabilizer function for efficient photo capturing with little blur. The floating internal focusing structure inside of this Sigma macro lens works to make it easy to get a clear shot every time, free of any color aberration, distortion, and odd curvature. When using the 180 mm lens for Minolta cameras, the photographer also has the choice to manually focus or turn on the autofocus option. The built-in hyper sonic motor is smooth and quiet. This high-speed f/2.8 lens is equipped with a rounded 9-blade diaphragm for soft, flattering portrait photos, and the glass is coated for optimum protection against unsightly light flares. The Sigma macro lens can even be used for close-ups, as the focal length has a great range. The special FLD elements ensure image integrity on the 180 mm lens for Minolta.