Standard lens series pentax da lens mount pentax k lens speed 28 focal length 40 mm construction prime lens area of use night photography focus manual focus closest focusing distance 40 cm focal length equivalent to 35mm camera 60 mm number of aperture blades 9 minimum aperture 22 max aperture 28 filter thread 31 mm length 63 mm lens diameter 15 weight 89 g included in delivery lens cap lens pouch lens hood colour black