Super telephoto zoom lens series pentax smc da lens mounts pentax k pentax kaf lens speed 45 focal length 55 300 mm zoom factor 55 times suitable for sensor type aps c construction zoom lens area of use close up photography landscape photography indoor photography focus auto focus manual focus reduced frame size closest focusing distance 95 cm focal length equivalent to 35mm camera 85 450 mm lens types aspherical ed lens construction groupsele