A new Canon patent application 2021-81531A (Japan) discusses optical formulas for a 83mm f/1.4 lens for RF-mount mirrorless cameras.
Embodiment 1
- Focal length (mm): 82.87
- F number: 1.45
- Half angle of view (degree): 14.63
- Image height (mm): 21.64
- Lens length (mm): 126.50
- Back focus (mm): 13.00
Embodiment 2
- Focal length (mm): 82.86
- F number: 1.45
- Half angle of view (degree): 14.63
- Image height (mm): 21.64
- Lens length (mm): 128.50
- Back focus (mm): 17.13
Embodiment 3
- Focal length (mm): 82.64
- F number: 1.45
- Half angle of view (degree): 14.67
- Image height (mm): 21.64
- Lens length (mm): 113.70
- Back focus (mm): 18.16