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
- 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