And yet another Canon patent for a lens for the EOS R full frame mirrorless camera system, Canon patent application 2020-181169A (Japan) discusses optical formulas for an RF 80mm f/2.8 Macro 1:1 lens. Focal length: 80.45 mm F number: 2.90…
Canon Patent: RF 80mm f/2.8 Macro 1:1 Lens For EOS R System