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Canon News has uncovered a patent which details the optical formulas for a couple of super telephoto zooms, including an RF 70-400mm f/4.5-5.6L IS USM, a lens we're told will appear sometime in the first half of 2020.
In the same patent, Canon also mentions an RF 70-300mm f/4-5.6, a lens we could see appear as a non-L telephoto zoom.
Canon RF 70-300mm f/4-5.6:
- Focal length: 72.00mm 146.00mm 290.00mm
- F number: 4.08 4.88 5.67
- Half angle of view: 16.72° 8.43° 4.27°
- Image height: 21.64mm 21.64mm 21.64mm
- Total lens length: 140.00mm 177.20mm 210.00mm
- BF: 25.13mm 44.86mm 61.65mm
Canon RF 70-400mm f/4.5-5.6L IS USM:
- Focal length: 72.62mm 168.49mm 389.89mm
- F number: 4.07 5.10 5.85
- Half angle of view: 16.59° 7.32° 3.18°
- Image height: 21.64mm 21.64mm 21.64mm
- Total lens length: 187.91mm 236.14mm 268.26mm
- BF: 13.80mm 27.53mm 35.04mm
