RF 28-70mm F2.8 and 28-60mm F4 from CANON

CANON filed a patent discussing 28-70mm F2.8 and 28-60mm F4 for 35mm full-frame mirrorless cameras.

【公開番号】特開2021-179550(P2021-179550A)　click here
【公開日】令和3年11月18日(2021.11.18)
【発明の名称】ズームレンズ及びそれを有する撮像装置

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