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Saturday, January 25, 2014

Canon Patent For 11-24mm f/4 Lens

Egami, the Japanese Blog has uncovered a Canon patent for a 11-24mm f/4 lens design. Currently, they do not have a lens in this focal range. Nikon has their 14-24mm f/2.8 lens and other third party lenses are also available. Personally, I have little use for such a lens. The closest model I own are the Canon EF 16-35mm f/2.8L II and the EF 8-15mm f/4L Fisheye.

Patent Publication No. 2014-10286

  • Publication date 2014.1.20
  • Filing date 2012.6.29

Example 1

  • Zoom ratio 2.06
  • Focal length f = 11.30-18.00-23.30mm
  • Fno. 4.10
  • Half angle ? = 62.42-50.24-42.88mm
  • Image height Y = 21.64mm
  • 172.19-161.28-162.86mm overall length of the lens
  • BF 38.82-52.31-63.15mm

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