Canon Patent for EF-S 17-55 f/3.5-5.6 IS STM Kit Lens

Egami spotted another patent filed by Canon. The new patent describes the EF-S 17-55 f/3.5-5.6 IS STM lens which looks like to be a new kit lens for APS-C sensor Canon DSLRs.

Canon EF-S 17-55 f/3.5-5.6 IS STM lens could be announced this year as a replacement for the current EF-S 18-55mm f/3.5-5.6 IS STM lens. The new 17-55 kit lens could also be waiting to be announced from last year. Also there is an example for the 18-55mm kit version.

Below are the patent details translated by machine.

Canon Patent for EF-S 17-55 f/3.5-5.6 IS STM Lens

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

via EG