Categories

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

Canon-100-400-STM-Lens-pate

Two old patent 2012 recenlty  surfaced over the web. One of the patent is of   an EF 100-400 f/4.5-5.6 STM lens and the patent is of  the EF-S 55-250 f/4-5.6 IS STM.

More details below:-

  • 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
 

Leave a Reply

Top-5-Photo-contest-image
camera-comparison-dtatbase best-pro-compact-camer-imagbest-entry-level-dslr-imageBest-APS-C-mid-range-DSLR-iBest-pro-C-mid-range-DSLR-iBest-fullframe-camera-image
Best-Camera-of-2016-button-

Subscribe to Blog via Email

Enter your email address to subscribe to this blog and receive notifications of new posts by email.

Join 40 other subscribers