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Sigma has filed an optical formula patent for an 11-22 f/4.5-5.6 Art series lens for full frame DSLRs.
Patent Publication No. 2015-203734 (Google Translated)
- Published 2015.11.16
- Filing date 2014.4.11
- Zoom ratio 1.88
- Wide-angle intermediate telephoto
- Focal length 11.33 15.33 21.30
- F-number 4.50 5.00 5.86
- Total angle of view 2ω 126.85 108.80 87.93
- Image height Y 21.63 21.63 21.63
- Overall length of the lens 163.42 156.24 156.59
An ultra wide angle full frame Art series lens from Sigma has been rumored for quite some time and is a logical addition to their Art series lineup.