Canon is full steam ahead as far as lens development goes, as a whole slew of optical formulas have appeared at patent offices.

First up, the RF mount.

Japan Patent Application 2019-066701

Canon RF 15-35mm f/2.8L

  • Focal distance 15.30mm 24.20mm 34.00mm
  • F number 2.91 2.91 2.91
  • Field angle 54.73° 41.80° 32.47°
  • Image height 21.64mm 21.64mm 21.64mm
  • Whole length of the lens 135.05mm 125.84mm 125.33mm
  • BF 13.00mm 22.20mm 32.26mm

Canon RF 17-70mm f/3.5-5.6

  • Focal distance 17.3mm 35.00mm 68.00mm
  • F number 3.58 4.18 5.85
  • Field angle 51.35° 31.72° 17.65°
  • Image height 21.64mm 21.6mm4 21.64mm
  • Whole length of the lens 142.70mm 138.53mm 143.42mm
  • BF 13.32mm 29.60mm 57.62mm


Japan Patent Application 2019-066654

Canon RF 15-35mm f/4L

  • Focal distance 15.45mm 24.00mm 34.00mm
  • F number 4.12 4.12 4.12
  • Half field angle 54.47° 42.03° 32.47°
  • Image height 21.64mm 21.64mm 21.64mm
  • Whole length of the lens 125.38mm 119.21mm 116.89mm
  • BF 12.00mm 19.66mm 24.40mm

Canon RF 16-35 f/4L

  • Focal distance 16.48mm 24.00mm 34.00mm
  • F number 4.12 4.12 4.12
  • Half field angle 52.70° 42.03° 32.47°
  • Image height 21.64mm 21.64mm 21.64mm
  • Whole length of the lens 127.27mm 116.39mm 111.30mm
  • BF 10.95mm 16.82mm 23.58mm

Japan Patent Application 2019-066653

Canon RF 14-40mm f/4L

  • Focal distance 14.43mm 21.62mm 40.74mm
  • F number 4.12 4.12 4.12
  • Half field angle 56.30° 45.01° 27.97°
  • Image height 21.64mm 21.64mm 21.64mm
  • Whole length of the lens 138.31mm 128.15mm 129.29mm
  • BF 12.84mm 12.84mm 12.84mm

Canon RF 16-40mm f/4L

  • Focal distance 16.41mm 23.12mm 38.80mm
  • F number 4.12 4.12 4.12
  • Half field angle 52.82° 43.10° 29.14°
  • Image height 21.64mm 21.64mm 21.64mm
  • Whole length of the lens 118.88mm 112.53mm 114.89mm
  • BF 12.78mm 12.78mm 12.78mm
Leave A Reply