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Canon Patent: 70-200mm f/4 Lens (Canon EF 70-200mm f/4L II On The Way?)

Canon Patent

Egami (translated) spotted a patent filed by Canon that most probably refers to the next iteration of the Canon EF 70-200mm f/4L USM, released in 2006. Canon has another 70-200 in their lineup, the image stabilized EF 70-200mm f/4L IS.

canon patent

Performance

  • Patent Publication No. 2013-105131
    • Publication date 2013.5.30
    • Filing date 2011.11.16
  • Example 1
    • Zoom ratio 2.68
    • Focal length f = 72.11-131.37-193.4mm
    • Fno. 4
    • Half angle ω = 16.7-9.35-6.38 °
    • Image height 21.64mm
    • The overall length of the lens 234.52mm
    • BF 50.12mm
  • Example 2
    • Zoom ratio 2.68
    • Focal length f = 72.14-130.58-193.38mm
    • Fno. 4
    • Half angle ω = 16.69-9.41-6.38 °
    • Image height 21.64mm
    • The overall length of the lens 213.85mm
    • BF 39.96mm
  • Example 3
    • Zoom ratio 2.68
    • Focal length f = 72.11-132.09-193.4mm
    • Fno. 4
    • Half angle ω = 16.7-9.3-6.38 °
    • Image height 21.64mm
    • The overall length of the lens 233.51mm
    • BF 49.05mm
  • Existing techniques
    • If you have a single focus group is easy aberration There is a change in the RF and IF
  • Canon patent
    • Inner zoom
    • Inner focus
    • Floating
    • MOD 300mm
    • β (Tele) = -0.5
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