Patents: 28-135 f/4-5.6 & 28-300 f/3.5-5.6

Patents: 28-135 f/4-5.6  & 28-300 f/3.5-5.6

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A couple of new lens formula patents which seems to address lowering chromatic aberrations in a new way

Patent Publication No. 2012-163746

  • 2012.8.30 Release Date
  • 2011.2.7 filing date

Example 4

  • Zoom ratio 4.67
  • 56.11 – – 131.85mm f = 28.21 focal length
  • Fno 4.12 -. 4.89 – 5.77
  • Half angle of view ω = 37.48 – 21.09 – 9.32deg.
  • Image height 21.64mm
  • 242.67 – – 266.43mm 224.00 overall length of the lens
  • BF 55.79 – 70.40 – 82.95mm
  • 20 sheets of 14 group lens configuration
  • Two two-sided aspherical
  • Three low-dispersion glass
  • Four Super UD glass
  • 102.40mm effective diameter of the first surface
  • 5-group zoom negative positive negative

Example 5

  • Zoom ratio 10.31
  • 93.64 – – 307.06mm f = 29.77 focal length
  • Fno 3.31 -. 4.71 – 5.85
  • Half angle of view ω = 36.00 – 13.01 – 4.03deg.
  • Image height 21.64mm
  • 263.66 – – 304.01mm 209.34 overall length of the lens
  • BF 61.72 – 89.40 – 106.84mm
  • 18 sheets 12 groups lens configuration
  • Three 3 aspherical surface
  • Three low-dispersion glass
  • 2 UD glass sheets
  • 84.36mm effective diameter of the first surface
  • 5-group zoom negative positive negative
  • In the zoom lens of the positive lead type, reducing the chromatic aberration of magnification of the secondary
Source: [EG]

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