Canon Patents

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

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A new patent for an EF 100-400 f/4.5-5.6 STM has appeared. Also in the patent is the EF-S 55-250 f/4-5.6 IS STM, so this patent is probably just covering an additional optical formula that will not become a product. I’d think any 100-400 replacement will be an L lens with an Ultrasonic Motor instead of an STM.

  • 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 ω = 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 ω = 11.69-6.17-3.18 °
    • Image height 21.64mm
    • 245.09-285.06-308.91mm overall length of the lens
    • BF 68.73mm

Source: [EG]

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