Sigma Patent for 20mm f/1.8 DG HSM Contemporary Lens

Sigma filed a new patent in Japan. The new patent describes a Sigma 20mm f/1.8 DG HSM Contemporary lens designed for full-frame DSLRs.

The Contemporary lens series from Sigma is usually not expensive as sports versions and uses less elements for coating.

Sigma currently has the old 20mm f/1.8 EX DG model and the new 20mm f/1.4 DG HSM Art model in their lineup for the same 20mm focal length.

This would be a great upgrade for the old 20mm model as suitable for the DSLR users with affordable prices. See below for the patent details.

Sigma 20mm f/1.8 DG HSM Contemporary Lens Patent


  • 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

via Egami

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