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Canon Patent: 18-270mm , 18-300mm , 18-200mm , 16-240mm , 16-200mm f/3.5-5.6 Lenses

Canon Patent

New APS-C superzooms coming?

Egami (translated) spotted a new Canon patent. The patent refers to 18-270mm , 18-300mm , 18-200mm , 16-240mm , 16-200mm f/3.5-5.6 lenses.

Description and self-interpretation of the patent literature

  • Patent Publication No. 2013-190453
    • Publication date 2013.9.26
    • Filing date 2012.3.12
  • Example
    embodiment
    No. Focal length Fno. Half angle Lens constitution Aspheric surface UD glass
    One 18.75 – 59.52 – 270.67 3.18 – 4.69 – 5.88 36.08 – 12.93 – 2.89 19 pieces of 14 group Three 3 surface Three
    Three 18.67 – 54.99 – 299.50 3.39 – 4.79 – 5.88 36.18 – 13.95 – 2.61 21 pieces of 16 group Four 4 surface Three
    Four 18.54 – 49.15 – 194.16 3.22 – 4.22 – 5.66 36.36 – 15.52 – 4.02 18 pieces in 11 groups Two 2 surface Three
    Six 16.53 – 54.38 – 237.95 3.42 – 4.72 – 5.88 39.56 – 14.10 – 3.29 18 sheets 13 group Four 4 surface Two
    Seven 16.81 – 47.39 – 194.13 3.32 – 4.46 – 5.66 39.07 – 16.07 – 4.02 17 pieces of 12 group Two 2 surface Two
  • Canon patent
    • 6-group zoom of positive and negative positive and negative positive and negative
    • Rear focus
Canon Patent
From left to right: spherical aberration, astigmatism, distortion, lateral chromatic aberration.
[via Egami]
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