Canon continues to develop diffractive optics technology, and this time it’s for the EF-M mount. A patent for an EF-M 55-300mm f/4.5-5.6 DO IS optical formula has appeared. The lens is for APS-C mirrorless cameras.
Patent Publication No. 2015-232674 (Google Translated)
- Published 2015.12.24
- Filing date 2014.6.11
- Zoom ratio 5.27
- Focal length 55.04 135.00 290.01
- F-number 4.60 5.18 6.30
- Angle of view 13.94 5.78 2.70
- Image height 13.66 13.66 13.66
- Overall length of the lens 136.00 175.46 192.00
- BF 35.50 35.50 35.50
I’m not sure how likely a DO lens is for the EOS M system, unless they’ve figured out a way to bring costs down.
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