Canon Patents: RF 24-70mm f/2.8 & RF 28-85mm f/2-2.8 Lenses

New Canon patents filed describing 24-70mm f/2.8 and RF 28-85mm f/2-2.8 Lenses for Canon RF-mount cameras.

The lenses in the examples are all for full frame mirrorless cameras, and you can see that IS is attached from the lens configuration diagram. The 24-70mm F2.8 is a standard standard zoom, but the 28-85mm F2-2.8 has specs that we rarely see.

The total length of 28-85mm F2-2.8 is 138.5mm excluding the flange back of the RF mount, so it seems that it fits in a practical size. This will be a lens more suitable for portraits than the standard zoom of Daisangen.

[Publication number] P2019049645
[Publication date] APRIL 4, 2022
[Patent application title] Optical system and imaging device

Example 1 (24-70mm F2.8)

  • Zoom ratio 2.75
  • Focal length 24.71 45.00 67.90
  • F number 2.88 2.88 2.88
  • Half angle of view (degrees) 41.21 25.68 17.67
  • Image height 21.64 21.64 21.64
  • Lens overall length 143.89 161.78 179.68
  • Back focus 13.42 27.34 38.58

Example 5 (28-85mm F2-2.8)

  • Zoom ratio 3.04
  • Focal length 28.00 53.77 85.00
  • F number 2.00 2.60 2.88
  • Half angle of view (degrees) 37.69 21.92 14.28
  • Image height 21.64 21.64 21.64
  • Lens total length 158.50 176.83 195.16
  • Back focus 16.00 28.52 41.05

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