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Canon patent for EF-M 600mm f / 5.6 DO IS lens

Canon filed a patent for a EF-M 600mm f / 5.6 DO IS, a lens with diffractive optics for the EOS M system. Patent Publication No. 2015-215437 Published 2015.12.3 Filing date 2014.5.9…

Canon patent for EF 600mm f/4 DO IS USM lens

Canon filed a patent for an EF 600mm f/4 DO IS lens, i.e. a lens with diffractive optical elements. Patent Publication No. 2015-11171 Published 2015.1.19 Filing date 2013.6.28 Example 2…

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