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Japan Patent Application 2018185386 showcases an optical formula for an EF-M 10mm f/2.8 Fisheye lens. The short backfocus distance tells us it’s for a mirrorless application, and we’re pretty sure there will NOT be dedicated APS-C lenses for the EOS R system.
Is a fisheye needed for the EOS M lineup? Probably not, but if priced right, it could be a solid niche lens for the system.