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Sigma filed14mm f/3.5 lens patent for mirrorless cameras with APS-C sensors

Sigma-lens-patentA new lens patent for a 14mm f/3.5 lens for mirrorless cameras with APS-C sensors was recently filed by Sigma. And according to this new patent this would be a zero-distortion lens just like new Laowa lens.

  • Patent Publication No. 2016-139087
  • Published 2016.8.4
  • Filing date 2015.1.29

Example 1

  • INF 200mm
  • Focal length 13.98 13.28
  • F-number 3.53 3.54
  • Full angle of view 2ω 90.74 92.90
  • The image height Y 14.20 14.20
  • Overall length of the lens 89.25 89.25
  • BF 17.5750
  • Lens configuration 8 groups 10 sheets
  • 2 aspherical three sides
  • ED 1 ( sigma in ELD)
  • Fluorite 4 ( sigma in FLD)

Example 2

  • INF 200mm
  • Focal length 13.97 13.28
  • F-number 4.13 4.13
  • Full angle of view 2ω 90.90 92.68
  • The image height Y 14.20 14.20
  • Overall length of the lens 82.60 82.60
  • BF 17.6874
  • Lens configuration 8 groups 10 sheets
  • 2 aspherical three sides
  • ED 1 ( sigma in ELD)
  • Fluorite 4 ( sigma in FLD)
  • Sigma patents
  • FumakeTadashi
  • Inner focus (the second group)

Via- Egami

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