New Patents: Canon RF 28-70mm f/2.8 & RF 28-60mm f/4 Lenses

Canon has filed two new RF lens patents for the 28-70mm f/2.8and RF 28-60mm f/4 Lenses, which are designed for Canon EOS R system. Take a look at the patent details below:

[Publication number] JP 2021-179550(P2021-179550A)
[Publication date] November 18, 2021
[Patent application title] Optical system and imaging device

Embodiment 1

Zoom ratio: 2.35
Focal length (mm): 28.84 39.89 67.90
F number: 2.91 2.91 2.91
Half angle of view (degree): 32.65 28.06 17.67
Image height (mm): 21.64 21.64 21.64
Lens length (mm): 149.46 133.18 115.94
Back focus (mm): 13.48 19.38 27.78

Embodiment 2

Zoom ratio: 2.35
Focal length (mm): 28.84 39.96 67.90
F number: 2.91 2.91 2.91
Half angle of view (degree): 32.68 27.27 17.67
Image height (mm): 18.50 20.60 21.64
Lens length (mm): 152.91 136.27 115.98
Back focus (mm): 13.50 19.41 26.94

Embodiment 3

Zoom ratio: 2.08
Focal length (mm): 28.84 33.20 60.00
F number: 4.12 4.12 4.12
Half angle of view (degree): 32.68 31.82 19.83
Image height (mm): 18.50 20.60 21.64
Lens length (mm): 141.33 130.27 104.61
Back focus (mm): 19.70 21.65 35.51

Embodiment 4

Zoom ratio: 2.35
Focal length (mm): 28.84 37.16 67.90
F number: 2.91 2.91 2.91
Half angle of view (degree): 32.68 29.00 17.67
Image height (mm): 18.50 20.60 21.64
Lens length (mm): 121.04 110.42 101.92
Back focus (mm): 9.97 13.25 25.53

Embodiment 5

Zoom ratio: 2.35
Focal length (mm): 28.84 39.87 67.90
F number: 2.91 2.91 2.91
Half angle of view (degree): 32.65 28.07 17.67
Image height (mm): 21.64 21.64 21.64
Lens length (mm): 146.19 132.32 116.42
Back focus (mm): 14.84 20.01 28.77

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