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

Canon Patent

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)
Canon Patent
Performance chart. From left to right: spherical aberration, astigmatism, distortion, chromatic aberration.
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