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Canon patent for EF 28-560mm f/2.8-5.6L USM lens

canon patentCanon filed a patent for a EF 28-560mm f/2.8-5.6 optical formula that seems to be for an “L” lens (if I got the machine translated description right).

This is the second patent for a superzoom lens, after a crazy patent for a EF 40-800mm F4.5-5.6 lens. Hard to say if this patents will ever hit the market. Good to know Canon is working on such ideas.

  • Patent Publication No. 2016-142795
    • Published 2016.8.8
    • Filing date 2015.1.30
  • Example 1
    • Zoom ratio 18.86
    • Focal length 28.80 119.57 543.20
    • F-number 2.88 4.56 5.88
    • Half angle of view (degrees) 36.91 10.26 2.28
    • Image height 21.64 21.64 21.64
    • The total lens length 281.07 331.07 385.01
    • BF 53.05 61.31 40.00
    • The effective diameter of the front lens 120.00
[via Egami]
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