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Another EF-M optical formula patent has appeared, this time for a EF-M 9-17mm f/3.5-5 STM. The front element on the lens is quite interesting going by the image above.
Patent Publication No. 2016-85259 (Google translated)
- Published 2016.5.19
- A wish day 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
- Like high 11.79 13.40 13.40
- Overall length of the lens 85.22 79.65 81.94
- BF 14.99 16.82 15.41
As with all of the EF-M patents, this is for a crop camera and we believe that the next EOS M body announced will be APS-C as well.