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Saturday, October 12, 2013

Canon Patent - 35mm f/1.4L II Lens




Egami, the Japanese Photography Blog has discovered a Canon Patent for the EF 35mm f/1.4L II lens. Also included in the patent are formulas for a 14mm f/2.8 and a 24mm f/2.8. Click here to see the original post in Japanese.

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 ? = 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 ? = 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 ? = 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

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