Telephoto lens series pentax smc da lens mounts pentax k pentax kaf lens speed 28 focal length 200 mm suitable for sensor type aps c construction prime lens area of use close up photography night photography focus internal focus auto focus manual focus af motor ultrasonic motor usm reduced frame size max magnification 15 closest focusing distance 120 cm focal length equivalent to 35mm camera 300 mm lens type ed lens construction groupselement