Canon Patent For 20mm f/1.4 and 12-24mm f/4.3-5.6 Lenses For EF Mount
Hi Lows Note spotted a Canon patent application (2019-128526, Japan) describing optical formulas for a 20mm f/1.4 and a 12-24mm f/4.3-5.6 lens, both for the Canon EF mount. 20mm f/1.4…