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Canon Patent for 200-400mm Teleconverter Lens

Canon Patent

Source: Egami (translated).

Canon filed a patent for a 200-400mm lens with built-in teleconverter and image stabilisation.

  • Patent Publication No. 2013-238827
    • Publication date 2013.11.28
    • Filing date 2012.5.17
  • Example 1
    • Zoom ratio 1.90
    • Focal length f = 205.00 – 389.99mm
    • Fno. 4.12
    • Half angle ω = 6.02 – 3.18 °
    • Image height Y = 21.64mm
    • The overall length of the lens 389.84mm
    • BF 68.49mm
    • Teleconference insertion
      • Focal length f = 287.00 – 545.98mm
      • Fno. 5.77
      • Half angle ω = 4.31 – 2.27 °
  • Example 2
    • Focal length f = 585.10mm
    • Fno. 4.12
    • Half angle ω = 2.12 °
    • Image height Y = 21.64mm
    • The overall length of the lens 467.32mm
    • BF 83.15mm
    • Teleconference insertion
      • Focal length f = 819.00mm
      • Fno. 5.77
      • Half angle ω = 1.51 °
  • Example 3
    • Zoom ratio 1.90
    • Focal length f = 307.50 – 585.00mm
    • Fno. 5.88
    • Half angle ω = 4.02 – 2.12 °
    • Image height Y = 21.64mm
    • The overall length of the lens 405.00mm
    • BF 75.70mm
    • Teleconference insertion
      • Focal length f = 427.00 – 812.33mm
      • Fno. 8.17
      • Half angle ω = 2.90 – 1.53 °
  • Canon patents
    • Teleconverter BF is the same in insertion and after insertion before
    • Vibration control
    • Teleconference to be inserted into the appropriate location, teleconverter can be miniaturised

Canon Patent

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