Nikon Nikkor 50mm f/1.4 AF-S Standard Lens
Using a DX lens on a full frame DSLR introduces a crop factorwhich takes away the benefit of using full frame. While the Nikon AF-S Nikkor 50mm f/1.8G Fixed Lens is the best lens for DX format cameras, the AF-S Nikkor 50mm f1.4 Fixed Lens is the best option for full frame Nikon cameras. The f1.4 aperture means superior speed, which translates into an excellent depth of field range and superior low light performance. And of course this lens has all of Nikon's top coatings, a quiet autofocus motor and a auto/manual focus switch. The lens weighs less than 10 ounces and is just over two inches long.