Canon Patent Application: Canon EF Supertelephotos Canon Patent Application: Canon EF Supertelephotos January 23, 2020
Canon Patent Application: Apodization filter lenses for the EF mount Canon Patent Application: Apodization filter lenses for the EF mount July 18, 2019
Canon Patent Application: Switchable teleconverter Canon Patent Application: Switchable teleconverter Jun 20, 2019