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Canon Patent: 35mm f/1.4 Lens – Successor of The EF 35mm f/1.4L On Its Way?

Canon Patent

This could be the patent for the Canon EF 35mm f/1.4L II lens. Egami (translated) spotted a patent filed by Canon that’s related to a 35mm f/1.4 lens that appears to refer to the successor of the Canon EF 35mm f 1.4L USM (price & specs) lens (released in 1998). Not the first patent for a 35mm lens, and there was a rumor that Canon was field-testing a EF 35mm f/1.4L II lens. More after the break.

  • Patent Publication No. 2013-195747
    • Publication date 2013.9.30
    • Filing date 2012.3.21
  • Example 1
    • Focal length f = 14.17mm
    • Fno. 2.89
    • Half angle ω = 56.78 °
    • Image height 21.64mm
    • The overall length of the lens 133.50mm
    • BF 40.23mm
    • 14 pieces in 11 groups Lens Construction
    • 2 pieces of 2 aspherical surface
    • The effective diameter of the front lens 69.96mm
  • Example 2
    • Focal length f = 24.50mm
    • Fno. 2.80
    • Half angle ω = 41.45 °
    • Image height 21.64mm
    • The overall length of the lens 92.07mm
    • BF 38.07mm
    • 8 group 9 lenses configuration
    • 2 pieces of 2 aspherical surface
    • The effective diameter of the front lens 34.58mm
  • Example 3
    • Focal length f = 35.50mm
    • Fno. 1.45
    • Half angle ω = 31.36 °
    • Image height 21.64mm
    • The overall length of the lens 135.01mm
    • BF 38.56mm
    • 11 pieces Lens Construction 9 group
    • One piece of one aspherical surface
    • The effective diameter of the front lens 49.79mm
  • Canon patent
    • Inner focus
Canon Patent

Left to right: spherical aberration, astigmatism, distortion, lateral chromatic aberration

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