

A new patent application surfaced online in Japan yesterday (P2022-21154A) for a NIKKOR Z 85mm f/1.2 lens. Several different designs are described in the patent plication – see the diagrams above. Here are the details for the #1 lens design:
- Focal length (f): 84.7mm
- Aperture (FNO): f/1.22
- Angle of view (2ω): 28.42°
- Image height (Ymax): 21.60mm
- Overall length (TL): 134.82mm
- Back focus (BF): 11.46mm
What’s most interesting is that the purpose of the patent is to build a lens with defocus control (control of the spherical aberration), like the older Nikon AF DC-Nikkor 105mm f/2D and Nikon AF DC-NIKKOR 135mm f/2D, and the Canon RF DS lenses (Defocus Smoothing).
Indeed, paragraph 57 [Summary] begins as follows (translated):


















