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