Nikkor 50mm f/1.2 AI is the fastest normal manually-focusing Nikkor lens. The 50mm provides bright viewing, even under dim light situations. The lens features automatic maximum aperture indexing (AI) with suitably equipped cameras, through the meter coupling ridge provided. It has sharp optics that can compete with modern lenses. The 50mm lens employs optical construction of seven element in six groups, 46° angle of view, 1.6 feet close focusing distance and 52mm filter thread.The lens is a compact, lightweight and versatile lens suitable for portraiture and an array of photographic applications.