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Canon Patent For 55-300mm f/4-5.6 IS STM Lens With Inner Focusing

Canon Patent For 55-300mm f/4-5.6

Egami (translated) spotted a patent filed by Canon for a 55-300mm lens with image stabilisation and inner focusing (lens does not extend when focusing). The patent ale refers to a EF-S 55-250mm F4-5.6 IS STM lens

  • Patent Publication No. 2014-145960
    • Published Date 2014.8.14
    • Filing date 2013.1.30
  • Example 3
    • Zoom ratio 5.20
    • Focal length f = 56.80-135.16-241.32mm
    • Fno. 4.16-5.18-5.88
    • Half angle ω = 13.52-5.77-3.24 °
    • Image height Y = 13.66mm
    • The overall length of the lens 153.89-191.28-208.89mm
    • BF 38.57-57.95-65.38mm
  • Example 5
    • Zoom ratio 5.20
    • Focal length f = 56.37-133.75-293.01mm
    • Fno. 4.16-5.18-5.88
    • Half angle ω = 13.62-5.83-2.67 °
    • Image height Y = 13.66mm
    • The overall length of the lens 155.00-190.52-210.00mm
    • BF 38.40-54.49-65.40mm
  • Canon patents
    • Inner focus
    • Vibration control
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