Standard zoom lens series pentax da lens mounts pentax k pentax kaf3 lens speed 4 focal length 18 50 mm suitable for sensor type aps c construction zoom lens area of use landscape photography close up photography focus auto focus manual focus af motor no internal af motor circular aperture max magnification 12 8 closest focusing distance 30 cm focal length equivalent to 35mm camera 27 5 76 5 mm lens types ed aspherical lens construction group