New patents: Sigma 20mm f/1.8 DG HSM and Canon EF 16-35mm f / 2.8 L USM lenses

Sigma 20mm f:1.8 DG HSM lens patent
Sigma filed a patent in Japan for 20mm f/1.8 DG HSM Contemporary lens:

  • Patent number: 2016-12034
  • Published on January 21, 2016
  • Filed on June 30, 2014
  • Focal length: 20.70 21.01
  • F-number: 1.84 1.95
  • Full angle of view 2ω: 93.42 90.34
  • The image height Y: 21.63 21.63
  • Overall length of the lens: 139.73 139.73

Canon EF 16-35mm f : 2.8 L USM lens patent
Canon has a patent application for a EF 16-35mm f / 2.8 L USM lens.

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