Sigma has just filed a new patent: Sigma 20mm F1.8 DG HSM lens. This is a new ultra-wide prime contemporary lens for Full-frame sensor.
- Patent Publication No. 2016-12034 (Google Translated)
- Published 2016.1 .21
- Filing date 2014.6.30
- Example
- Focal length 20.70 21.01
- F number 1.84 1.95
- Total angle of view 2ω 93.42 90.34
- The image height Y 21.63 21.63
- Overall length of the lens 139.73 139.73
Source: EGI
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