Canon Patent News: APS-C 18-200mm, Full-Frame 28-200mm Lens Patent

Canon two new lens patent surfaced over the web, APS-C 18-200mm, Full-Frame 28-200mm Lens Patent surfaced over the web, take a look at the details below.

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Description and self-interpretation of the patent literature

• Patent Publication No. 2013-97184
  • Publication date 2013.5.20
  • Filing date 2011.11.1
• Example 1
  • Zoom ratio 10.39
  • Focal length f = 18.60-60.40-193.27mm
  • Fno. 3.48-4.98-5.88
  • Half angle ω = 36.27-12.74-4.04 °
  • Image height 13.65mm
  • 144.58-176.50-208.42mm overall length of the lens
  • BF 38.09-63.96-77.06mm
  • 16 pieces of 13-group lens configuration
  • Four four-sided aspherical
  • The effective diameter of the front lens 55.82mm
  • MOD 0.5m
• Example 3
  • Zoom ratio 6.69
  • Focal length f = 28.90-76.87-193.28mm
  • Fno. 3.60-5.27-5.88
  • Half angle ω = 36.82-15.72-6.39 °
  • Image height 21.64mm
  • 144.56-176.58-208.59mm overall length of the lens
  • BF 38.00-66.95-76.98mm
  • 15 pieces of 11-group lens configuration
  • Four four-sided aspherical
  • The effective diameter of the front lens 62.81mm
  • MOD 0.5m
• Canon patent
  • 5-group zoom positive and negative negative positive positive
  • Inner Focus (third group)
    • Because it is possible to reduce the beam effective diameter of the first group, can be miniaturized optical system
  • Image stabilization

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