Canon Patents

Patent: EF 14mm f/2.8 With a New Coating

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New Coating
Below seems to be a patent for large protruding front elements, that will help with issues of reflection and cleaning. This could possibly appear in the much talked about EF 14-24 f/2.8L.


Patent Publication No. 2012-159723

  • 2012.8.23 Release Date
  • 2011.2.1 filing date

Example 1

  • F = 14.3mm focal length
  • Fno. = 2.89
  • Half angle ω = 56.6 °
  • 14 images in 10 groups lens configuration
  • Existing coating roughness
  • Will making cleaning the front element easier and possibly less destructive

Canon patent

  • (Coating applied to one surface of a lens) thin film layer
  • Having a plurality of tubular spaces are arranged parallel to the tube
  • Maximum opening diameter of the tubular space below 400nm
  • The inorganic oxide materials (silica, titania)
Source: [EG]


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