Sigma 135mm f/1.8 DG DN and Tamron 16-70mm f/4, 20-72mm f/4, 28-72mm f/4 Patents Found

Sigma 135mm f/1.8 DG DN

  • [Publication Number] Japanese Patent Application Laid-Open No. 2021-85935 (P2021-85935A)
  • [Publication date] June 3, 2021
  • [Application date] November 26, 2019
  • [Applicant]
    [Identification number] 000131326
    [Name or name] Sigma Co., Ltd.
  • PROBLEM TO BE SOLVED: To provide an optical system which achieves miniaturization and weight reduction while correcting various aberrations such as chromatic aberration by appropriately selecting a glass material of a lens.
Example 1
Focal length 82.96
F value 1.46
Angle of view 28.12
Image height 21.63
full length 109.35
BF 24.0375
Example 8
Focal length 131.00
F value 1.85
Angle of view 18.04
Image height 21.63
full length 129.50
BF 29.0000

Tamron 16-70mm f/4, 20-72mm f/4, 28-72mm f/4

Embodiment 1
Focal length (mm): 16.48 33.54 67.88
F number: 4.12 4.12 4.12
Half angle of viw (degree): 54.46 31.40 16.88
Image height (mm): 19.60 21.63 21.63
Lens length (mm): 147.00 136.83 170.00


Embodiment 2
Focal length (mm): 16.48 33.53 67.89
F number: 4.12 4.12 4.12
Half angle of view (degree): 54.66 31.55 16.88
Image height (mm): 19.74 21.63 21.63
Lens length (mm): 140.00 125.98 145.07


Embodiment 3
Focal length (mm): 20.40 37.57 67.90
F number: 4.12 4.12 4.12
Half angle of view (degree): 48.64 30.07 16.87
Image height (mm): 19.68 21.63 21.63
Lens length (mm): 147.00 133.51 147.05


Embodiment 4
Focal length (mm): 28.85 46.35 72.75
F number: 2.88 2.88 2.89
Half angle of view (degree): 38.09 25.02 15.79
Image height (mm): 19.89 21.61 21.63
Lens length (mm): 135.00 138.51 166.43


Embodiment 5
Focal length (mm): 28.86 46.17 72.73
F number: 2.88 2.88 2.88
Half angle of view (degree): 38.02 25.30 15.77
Image height (mm): 20.12 21.30 21.63
Lens length (mm): 140.00 133.82 144.20


Embodiment 6
Focal length (mm): 20.41 37.58 67.89
F number: 4.12 4.12 4.12
Half angle of view (degree): 48.69 30.29 17.58
Image height (mm): 19.70 21.04 21.63
Lens length (mm): 147.00 140.98 152.83

via asobinet and hi-lows-note

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