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Canon News has uncovered a patent for more fast prime optical formulas. This patent deals with reducing weight and size for such lenses.
Canon News notes that the back focus is quite short, which would require the lens to enter the camera mount about 8mm. So these optical formulas aren't likely going to become a consumer product. However, we do see patents for optical formulas that are merely trying to solve problems, and in the case of this one… size and weight.
Canon 20mm f/1.8
- Focal length 20.60mm
- F-number 1.85
- Half angle of view (degrees) 46.40°
- Image height 21.64mm
- Lens total length 88.73mm
- BF 11.72mm
Canon 24mm f/1.8
- Focal length 23.28mm
- F-number 1.85
- Half angle of view (degrees) 42.90°
- Image height 21.64mm
- Lens total length 93.32mm
- BF 12.72mm
