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A new Canon Japan patent shows the optical formulas for various RF 50mm f/1.4 designs as well as an RF 35mm f/1.4. This patent deals with increasing focusing speed when using lens designs with large diameter elements.
I don’t think any of these optical formulas will become products, so the dream of a new 50mm f/1.4 from Canon probably won’t be coming true any time soon.
RF 50mm f/1.4 | RF 50mm f/1.4 | RF 50mm f/1.8 | |
Focal length | 51.50mm | 48.47mm | 48.49mm |
F value | 1.45 | 1.45 | 1.45 |
Half angle of view | 22.79° | 24.05° | 24.04° |
Image height | 21.64mm | 21.64mm | 21.64mm |
Lens length | 95.19mm | 108.84mm | 91.98mm |
Backfocus | 11.49mm | 11.39mm | 11.48mm |
RF 50mm f/1.4 | RF 35mm f/1.4 | ||
Focal length | 48.49mm | 33.99mm | |
F value | 1.45 | 1.45 | |
Half angle of view | 24.04° | 32.48° | |
Image height | 21.64mm | 21.64mm | |
Lens length | 116.56mm | 131.16mm | |
Backfocus | 13.23mm | 12.05mm |