Nikon patent for 18mm f/1.8, 20mm f/1.8 FX lenses
Nikon 18mm f/1.8 lens patent
Nikon filed a patent 2012-27450 in Japan for a 18mm f/1.8 and 20mm f/1.8 full frame lenses:
- Focal length: 18.4mm
- Aperture: 1.84
- Angle of view: 100.3deg
- Lens design: 14 elements in 11 groups
- 3 aspherical elements
- 3 ED elements
Nikon 20mm f/1.8 lens patent
- Focal length: 20.4mm
- Aperture: 1.84
- Angle of view: 94.7deg
- Lens design: 12 elements in 9 groups
- 3 aspherical elements
- 4 ED elements
It is typical for Nikon to patent several slightly different versions of each lens.
