Standard lens series pentax smc fa lens mounts pentax k pentax kaf lens speed 19 focal length 43 mm suitable for sensor types aps c full frame construction prime lens area of use night photography astrophotography indoor photography action photography news photography focus auto focus manual focus af motor no internal af motor max magnification 18 3 closest focusing distance 45 cm focal length equivalent to 35mm camera 65 mm lens types aspherical