Canon Patents

Patent: RF mount constant aperture superzoom lenses, including an RF 28-280mm f/2.8

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Canon News has uncovered a patent for various super zoom optical formulas, and they’re all for the RF mount except for one that appears to be for EF-S.

Canon RF 28-135mm f/4:

  • Focal length: 28.84mm 80.09mm 135.75mm
  • F-number: 4.12 4.12 4.12
  • Half angle of view: 33.13° 15.12° 9.06°
  • Image height: 18.82mm 21.64mm 21.64mm
  • Total lens length: 167.97mm 167.97mm 167.97mm
  • BF: 27.78mm 27.78mm 27.78mm

Canon RF 24-170mm f/4:

  • Focal length: 24.72mm 99.78mm 166.47mm
  • F-number: 4.12 4.12 4.12
  • Half angle of view: 37.29° 12.23° 7.40°
  • Image height: 18.82mm 21.64mm 21.64mm
  • Total lens length: 236.70mm 236.70mm 236.70mm
  • BF: 23.98mm 23.98mm 23.98mm

Canon RF 28-280mm f/2.8:

  • Focal length: 27.81mm 146.83mm 269.60mm
  • F-number: 2.88 2.88 2.88
  • Half angle of view: 34.09° 8.38° 4.59°
  • Image height: 18.82mm 21.64mm 21.64mm
  • Total lens length: 340.47mm 340.47mm 340.47mm
  • BF: 32.97mm 32.97mm 32.97mm

Canon EF-S 17-170mm f/3.5:

  • Focal length: 17.51mm 83.09mm 169.77mm
  • F-number: 3.61 3.60 3.61
  • Half angle of view: 36.33° 10.10° 4.98°
  • Image height: 12.88mm 14.80mm 14.80mm
  • Total lens length: 248.91mm 248.91mm 248.91 mm
  • BF: 40.40mm 40.40mm 40.40mm