Telephoto lens series pentax smc da lens mounts pentax k pentax kaf lens speed 4 focal length 300 mm suitable for sensor type aps c construction prime lens area of use close up photography animal photography focus internal focus auto focus manual focus af motor ultrasonic motor usm reduced frame size max magnification 14 closest focusing distance 140 cm lens types aspherical ed lens construction groupselements 68 number of aperture blades