Canon Patents

Patent: Canon RF 70-240mm f/4 IS and RF 70-300mm f/4-5.6 IS

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Canon is obviously busy developing new lenses for the RF mount, and we expect a lot of new lenses next year. We also expect some more affordable offerings for the RF mount.

In the latest round of patents, we see optical formulas for both an RF 70-240mm f/4 IS and an RF 70-300 f/4-5.6 IS.

Canon RF 70-240mm f/4 IS USM:

  • Focal length 72.10mm 131.78mm 242.00mm
  • F-number 4.10 4.10 4.10
  • Half angle of view 16.70° 9.32° 5.11°
  • Image height 21.64mm 21.64mm 21.64mm
  • Total lens length 147.22mm 176.39mm 210.90mm
  • BF 12.95mm 25.54mm 36.63mm

Canon RF 70-300mm f/4-5.6 IS USM:

  • Focal length 72.10mm 144.31mm 289.00mm
  • F-number 4.60 5.68 5.88
  • Half angle of view 16.70° 8.53° 4.28°
  • Image height 21.64mm 21.64mm 21.64mm
  • Total lens length 136.41mm 169.48mm 201.14mm
  • BF 12.95mm 28.75mm 42.22mm