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Leica Patent For 23mm f/1.7 Lens

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Leica has filed a new patent in Japan. The new patent describes Leica 23mm f/1.7 lens designed for mirrorless cameras with APS-c sized image sensors.

Leica currently has the Summicron-T 23mm f/2 ASPH model for T mount cameras.  Prime lens has a maximum aperture of f/2.

Leica T mirrorless camera ($1,850 – Amazon | B&H | Adorama) features a large 16-megapixel APS-C CMOS image sensor and a massive touchscreen display. See also the Leica T first impressions review and sample images here.

Leica 23mm f/1.7 Lens Patent


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

via Egami