Nikon filed two more patents (2013-019992, 2013-011831) in Japan for a new full frame 58mm f/1.2 lens. In the past there have been similar patents for a 50mm f/1.2, 58mm f/1.4 and 58mm f/1.2 lenses. Here are the technical details:
- Focal length: 58.0216
- Aperture: 1.229
- Half angle of view: 20.82 "
- Image height: 21.6
- Lens length: 122.05004
- Backfocus: 38.01861
- Lens design: 9 elements in 7 groups with three aspherical surfaces and possibly two ED elements (2 & 4)
Maybe Nikon is really serious about recreating the legendary Ai Noct Nikkor 58mm f/1.2 lens (read more about it here).