Tag Archives: 50300mm

Canon Patents EF & EF-M 50-300mm f/4.5-5.6 DO STM

According to the Egami Blog, Canon has patented an EF 50-300mm f/4.5-5.6 STM with diffractive optics and a similar EF-M version. Description of Patent  Patent Publication No. 2016-57444 Published 2016.4.21 Filing date 2014.9.9 EF Version Zoom ratio 5.59 Focal length 51.77 … Continue reading

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