According to the Egami Blog, Canon has filed a patent for a 600mm diffractive optics lens for mirrorless cameras.
Plans to release an EF-M 600mm f/5.6 DO IS may indicate that Canon is planning to take their mirrorless camera system to the next level by making it more attractive to high-end shooters as a primary imaging platform.
You can find more information regarding the patent on the Egami Blog.
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