Super wide angle lens series samyang umc samyang cs lens mount nikon f lens speed 2 focal length 16 mm suitable for sensor type aps c construction prime lens area of use landscape photography night photography indoor photography close up photography focus manual focus closest focusing distance 20 cm focal length equivalent to 35mm camera 16 mm lens types aspherical ed lens construction groupselements 1113 number of aperture blades 8 minimum apert