Canon Patent: 6-30mm (eq. 28-140) Zoom for Compact Cameras

Egami (translated) spotted a Canon patent for a zoom optic to be featured on PowerShot G and/or S-series compact cameras. Description and performance chart after the break.

• Patent Publication No. 2013-140307
  • Publication date 2013.7.18
  • Filing date 2012.1.6
• Example 1
  • Zoom ratio 4.86
  • Wide angle telephoto middle
  • 6.22-17.59-30.25mm focal length
  • Fno. 2.06-3.20-3.60
  • Half angle ω = 36.75-14.80-8.74 °
  • Image height Y = 4.65mm
  • 66.30-67.88-75.85mm lens length
  • BF 5.31mm
  • 11 pieces in 10 groups Lens Construction
  • Three four-sided aspherical
• Canon patent
  • 5-group zoom of positive and negative positive positive and negative
  • Rear Focus (Group 5), or inner focus (Group 4)