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

14mm f/3.5

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)
[via Egami]

 

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