New Canon Patents for 28-70mm f/2.8 & 28-60mm f/2.8 Lenses

New Canon Patent applications filed for a set of RF mount lenses. These new lenses are the Canon RF 28-70mm f/2.8 & 28-60mm f/2.8.

Canon patent application 2022091621 (Japan) discusses optical formulas for two small and compact zoom lenses with large aperture:

  • 28-70mm f/2.8
  • 28-60mm f/2.8

Example 1

  • Focal length: 28.84-67.90
  • F value: 2.91
  • Half angle of view: 32.68-17.67
  • Image height: 18.50-21.64
  • Overall length: 138.40-105.42
  • Back focus: 10.97-21.12

Example 2

  • Focal length: 28.84-60
  • F value: 2.91
  • Half angle of view: 32.68-19.83
  • Image height: 18.50-21.64
  • Overall length: 132.38-106.85
  • Back focus: 13.47-23.82

New Canon Patents : RF 28-70mm f/2.8 & RF 28-60mm f/4 Lenses

Here are two new Canon patent applications surfaced online. The company has filed two new RF lens patents for the 28-70mm f/2.8and RF 28-60mm f/4 Lenses, which are designed for Canon EOS R system.

[Publication number] JP 2021-179550(P2021-179550A)
[Publication date] November 18, 2021
[Patent application title] Optical system and imaging device

Take a look at the new Canon patents for RF 28-70mm f/2.8 & RF 28-60mm f/4 lenses. Continue reading “New Canon Patents : RF 28-70mm f/2.8 & RF 28-60mm f/4 Lenses”