Canon Patent: 10-20mm f/4, 10-20mm f/2.8-4 And 9-18mm f/4 Lenses
A new Canon patent application. Canon patent 2024023099 (Japan, published 2/21/2024) discusses optical formulas for three wide angle zoom lenses. 10-20mm f/4 10-20mm f/2.8-4 9-18mm f/4 From the patent literature:…