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 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
