Nikon filed another patent in Japan for a 50mm f/1.2 and 60mm f/1.2 lenses. The 50mm f/1.2 lens (and different variations of it) has been the most patented Nikkor lens in the past few years – here are some of the related patents filed in the past:
Compared to previous patents, the latest filing has calculations for optimized/reduced lens ghost and lens flare.