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Tuesday, February 4, 2014

Canon Patent : EF 70-400mm f/4.5-5.6L IS

The Canon EF 100-400mm f/4-5.6L IS II lens will be released some time this year. It will have the latest in coatings, glass deisgn and 4 stop IS compensation. The current 100-400mm lens is one of my favorite wildlife zoom lens and travels with me on every photo shoot. You can see my works on

Egami, the Japanese Photography blog has discovered a new Canon patent for an EF 70-400mm f/4.5-5.6L IS lens. I am not sure if the new design is just an extension of the current EF 70-300mm f/4-5.6L IS lens. If so, it can be another great lens since the current 70-300mm is the other favorite wildlife zoom lens in my equipment bag.

Description and self-interpretation of the patent literature

Patent Publication No. 2014-21256,2014-21257

  • Publication date 2014.2.3
  • Filing date 2012.7.18

Example 2

  • Zoom ratio 5.45
  • Focal length f = 71.33-144.71-388.95mm
  • Fno. 4.63-4.84-5.83
  • Half angle ? = 16.87-8.50-3.18 °
  • Image height Y = 21.64
  • 240.00-284.68-303.83mm overall length of the lens
  • BF 75.92-79.30-95.93mm
  • 6-group zoom of positive and negative positive and negative positive and negative
  • (Part of the fourth group) anti-vibration
  • Rear Focus (Group 6)

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