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Leica Patent 23mm APS-C Mirrorless Lens

Leica-T-imageLatest patent surfaced over the web that shows details of a 23mm Leica Lens by having bright F2.0 Aperture for APS-C Mirrorless system.

Description, self-interpretation of the patent literature

  • Patent Publication No. 2015-191237
    • Published 2015.11.2
    • Filing date 2014.3.28
    • Applicant Leica camera Aktiengesellschaft
  • Example
    • Focal length f = 23mm
    • Fno. Preferably F2.0
    • BF 15.7mm
    • Total length 54mm
    • Image circle 28.4mm
    • 4 times is desirable short-range total length
  • Leica patent
    • Deformation retro focus (rather than a retro focus for single-lens reflex, and the sense that shortened retro focus back focus)
    • 2-group configuration of positive ShiboTadashi
    • Inner focus (part of the second group)
    • The rear lens is aspherical
    • The optical design by code

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