Sony filed a patent (2011-107450) in Japan for a 50mm f/1.4 and f/1.2 lenses:
Sony 50mm f/1.4 lens patent
Sony 50mm f/1.2 lens patent
Three different calculations were described in the patent:
- Example 1
- Focal length: 49.98mm
- Aperture: 1.442
- Half angle of view: 23.73°
- One aspherical element
- Example 2
- Focal length: 51.54mm
- Aperture: 1.443
- Half angle of view: 23.17°
- No aspherical elements
- Example 4
- Focal length: 51.55mm
- Aperture: 1.233
- Half angle of view: 23.02°
- One aspherical element
