Canon patent shows off EOS M speedbooster-style adapter for EF lenses

This diagram from the patent shows the optical construction of the Converter Adapter (labelled CL) with a Master Lens (labelled ML) in front of it. A new patent application filed by Canon, and first detailed on Canon News, lays out the schematics for its own version of a speedbooster adapter that would enable Canon EOS M users to adapt EF lenses onto the EF-M mount. Japanese patent application 2018-189864 details an adapter that includes both a 0.8x focal length reducer, as well as a 'variable f...