Nikon 50mm f/1.2 and 60mm f/1.2 Lens Patents

Nikon filed new patents in Japan. New patents include the Nikon Nikon 50mm f/1.2 and 60mm f/1.2 lenses. Nikon has patents filed for the 50mm f/1.2 lens with different variations of it. This lens has been the most patented Nikkor lens in the past few years.

The latest Nikon patents has calculations for optimized/reduced lens ghost and lens flare. Below are the details of the new patents filed by Nikon for the 50mm f/1.2 and 60mm f/1.2 lenses. (translated by Google)

nikon-50-60-f12-lens-patents

Nikon 50mm f/1.2 and 60mm f/1.2 Lens Patents

Description and self-interpretation of the patent literature

  • Patent Publication No. 2013-145337
    • Publication date 2013.7.25
    • Filing date 2012.1.16
  • Example 1
    • Focal length f = 51.6
    • Fno. 1.21
    • Half angle ω = 23.25 °
    • Image height Y = 21.6mm
    • Length 92.60mm
    • Lens thickness 54.30mm
    • BF = 38.30mm
    • Seven six lens configuration
  • Example 3
    • Focal length f = 60.90
    • Fno. 1.21
    • Half angle ω = 19.81 °
    • Image height Y = 21.6mm
    • Length 92.0997mm
    • Lens thickness 53.8000mm
    • BF = 38.2997mm
    • Seven six lens configuration
  • Nikon patents
    • Positive and negative positive negative
    • Anti-reflective curtain with wet process
      • Of the multi-layer film, the surface side most
      • Refractive index n <= 1.30
      • And concave in the front and rear of the diaphragm, is applied to an appropriate position other
      • I reduce ghost and flare
    • I use a high refractive index and low dispersion lens
      • Correction sagittal aberration, axial chromatic aberration, lateral chromatic aberration, curvature of field without a diffractive optical element and aspherical

via EG & NR