Latest 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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