Super 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 close up photography animal photography focus manual focus af motor no internal af motor closest focusing distance 1 000 cm lens type aspherical lens construction groupselements 44 number of aperture blades 9 minimum aperture 32 max aperture 8 filter thread 67 mm coating multicoatin