Patent: Canon EF 14 f/2.8 with Fluorite

Patent for wide angle fluorite concepts
Canon has filed patent for a wide angle fluorite concept. Such a patent could be part of a new ultra-wide zoom lens, perhaps a 14-24 or a replacement to the 16-35. Egami also thinks it's possible this patent could be for the EF-M mount. It's an interesting read, even when Google translated. Read the full patent here.

• Patent Publication No. 2013-37339
  • 2013.2.21 Release Date
  • Filing date 2011.7.12
• Example 1
  • Zoom ratio 1.00
  • Focal length f = 1.00mm
  • Fno. 2.90
  • Half angle of view ω = 56.66 °
  • Image height Y = 1.52mm
  • 9.51mm length lens
  • BF 2.82mm
  • 6 aspherical surfaces, the first surface 25
  • Punctually
• Example 3
  • Zoom ratio 2.06
  • 2.06mm – f = 1.00 focal length
  • Fno 2.79 -. 4.00
  • Half angle of view ω = 51.27 – 32.82 °
  • 1.33mm – Y = 1.25 image height
  • 8.55mm – 8.79 length lens
  • BF 2.41 – 3.46mm
  • Aspheric first surface, the fifth surface, the first surface 26
  • Positive and negative positive negative
• Example 6
  • Zoom ratio 1.00
  • Focal length f = 1.00mm
  • Fno. 2.90
  • Half angle of view ω = 87.35 °
  • Image height Y = 21.60mm
  • 9.51mm length lens
  • BF 2.82mm
  • 6 aspherical surfaces, the first surface 25
  • Punctually

Source: [EG]

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