Macro lens telephoto lens series walimex pro lens mount sigma sa lens speed 8 focal length 500 mm suitable for sensor type aps c construction prime lens area of use macro photography close up photography animal photography focus manual focus auto focus af motor no internal af motor max magnification 13 closest focusing distance 170 cm lens type aspherical lens construction groupselements 67 number of aperture blades 9 minimum aperture 22 m