The nikon af s nikkor 28mm f18 g lens is a prime fast wide angle lens that is compatible with both the nikon dx and fx format the lens has a fast maximum aperture of f18 which ensures a bright viewfinder experience and a beautiful background image blur which is great for all types of photography especially portraiture the nikon af s 28mm f18 g lens uses nano crystal coat to prevent internal reflections that cause ghosting and flare and also includes a silent wave motor swm for smooth