佳能EF 16-40mm f/4 USM全画幅镜头专利。专利公开号:2015-206976,公开日:2015.11.19,申请日:2014.04.23。实例1:变焦比:2.36;焦距:16.48–24.40–38.90mm;光圈:4.12–4.12–4.12;像高:21.64毫米;后焦距:38.00–45.51–63.40mm;全长:177.74–162.40–159.73mm。消息连接:http://www.camerabeta.com/rumor/canon/canon-ef-16-40mm-f4-usm-lens-patent/1433
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