Sigma patent: 14mm f/3.5 lens for APS-C mirrorless cameras

It’s getting more and more interesting for mirrorless camera owners. Sigma filed a new patent for a 14mm f/3.5 lens for mirrorless cameras with APS-C sensors. According to the patent description this would be a zero-distortion lens, something we recently saw on a 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)