Nikon AF Nikkor 50mm f/1.8D Standard Prime Lens Nikon Lenses F mount JAA013DA. The Nikon AF Nikkor 50mm f/1.8D prime lens is lightweight and portable at 155g with great depth of field at apertures of up to f/22 and 45cm close focal distance. Excellent for discreet photography.. Nikon. JAA013DA. 018208021376