Canon Patents EF-M 9-17mm f/3.5-5 STM

According to the Egami Blog, Canon has patented an EF-M 9-17mm f/3.5-5 STM optical design.

Patent Description

• Patent Publication No. 2016-85259
• Published 2016.5.19
• Submission Date 2014.10.23
• Zoom ratio 1.79
• Focus distance 9.27 13.32 16.58
• F-number 3.60 4.38 5.11
• AOV 51.83 45.17 38.94
• Overall length of the lens 85.22 79.65 81.94
• BF 14.99 16.82 15.41