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Thursday, June 19, 2014

Canon Patent - EF 100-400mm f/4.5-5.6 IS STM



The Japanese blog, Egami has uncovered a new Canon patent for an EF 100-400mm f/4.5-5.6 STM lens. The same patent covers the EF-S 55-250mm f/4-5.6 IS STM lens as well. The highly anticipated announcement of the EF 100-400mm f/4.5-5.6L IS II lens, with the Ultrasonic motor instead of STM, may come in the first week of September.

 
Patent Publication No. 2014-102462

  •         Publication date 2014.6.5
  •         Filing date 2012.11.22

   Example 1

  •         Zoom ratio 4.24
  •         Focal length f = 56.90-133.00-241.28mm
  •         Fno. 4.12-5.04-5.83
  •         Half angle ? = 13.50-5.86-3.24 °
  •         Image height 13.66mm
  •         154.33-176.38-191.20mm overall length of the lens
  •         BF 41.21mm

 Example 5

  •         Zoom ratio 3.73
  •         Focal length f = 104.59-199.99-389.99mm
  •         Fno. 4.58-5.03-5.87
  •         Half angle ? = 11.69-6.17-3.18 °
  •         Image height 21.64mm
  •         245.09-285.06-308.91mm overall length of the lens
  •         BF 68.73mm

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