canonrumors : Patent: EF-M 55-300mm f/4.5-5.6 DO IS

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Patent: EF-M 55-300mm f/4.5-5.6 DO IS

By Canon Rumors | January 8, 2016 | Canon Patents

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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