
Sigma filed a patent in Japan for 20mm f/1.8 DG HSM Contemporary lens: Patent number: 2016-12034 Published on January 21, 2016 Filed on June 30, 2014 Focal length: 20.70 21.01 F-number: 1.84 1.95 Full 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 Canon has […]















