Nikon AF-S Nikkor 50mm f/1.4G Standard Prime Lens Nikon Lenses F mount JAA014DA. Providing an excellent high speed aperture with fast and quiet autofocus the Nikon AF-S Nikkor 50mm f/1.4G lens is a great choice for discreet compact prime photography such as documentary or street.. Nikon. JAA014DA. 018208021802