Patent: EF-S 17-55 f/3.5-5.6 IS STM

Patent: EF-S 17-55 f/3.5-5.6 IS STM

Another lens patent has shown up today. This time an EF-S 17-55 f/3.5-5.6 IS STM. Perhaps it’ll be a new kit lens this year and will replace the current 18-55 IS STM. However, this may also be a hold over from last years kit lens update.

Description and self-interpretation of the patent literature

  • Patent Publication No. 2014-21258
    • Publication date 2014.2.3
    • Filing date 2012.7.18
  • Example 2
    • Zoom ratio 2.92
    • Focal length f = 18.50-32.89-54.00mm
    • Fno. 3.49-4.39-5.80
    • Half angle ω = 36.44-22.55-14.20 °
    • Image height Y = 13.66mm
    • 119.77-110.06-120.23mm overall length of the lens
    • BF 37.98-52.51-74.3mm
  • Example 3
    • Zoom ratio 3.09
    • Focal length f = 17.50-32.05-54.00mm
    • Fno. 3.47-4.38-5.80
    • Half angle ω = 37.97-23.08-14.20 °
    • Image height Y = 13.66mm
    • 119.55-108.81-118.68mm overall length of the lens
    • BF 36.59-51.53-73.93mm
  • Canon patents
    • 4-group zoom of positive and negative positive negative
    • Inner folder – Kas (Group 3)
    • The fourth lens unit can also be used for anti-vibration

Source: [EG]

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