The Voigtlander Nokton is a revision of a classic lens (the Voigtlander Topcor) which was made in very limited quantities in 2003. Cosina bought the design and remade the lens in a Nikon mount complete with electronics that allows it to communicate with the camera’s autometering system. The lens is manual focus, of course, but metering is handled by the camera in a similar way to the Zeiss ZF lenses.
The Nokton provides really superb resolution in the center even wide open, and in the edges and corners by f/2.0. At f/5.6 its sharp enough that it exceeds most reviewers ability to measure—-one of the few lenses that can do so. Basically, the lens provides the image quality of Zeiss or Nikon primes costing much more.