Canon patents for 600mm f/4 and 400mm f/2.8 lenses

Canon filed a patent (2012-88427) in Japan for 600mm f/4 and 400mm f/2.8 lenses:

  • Patent release date: May 10, 2012
  • Patent filed on October 18, 2010
  • 600mm f/4 lens:
    • Focal length: 585.00mm
    • Aperture: 4.12
    • Image height: 21.64mm
    • Lens length: 468.50mm
    • Back focus: 90.78mm
    • Lens design: 15 elements in 9 groups, one aspherical element,  two UD elements
  • 400mm f/2.8 lens:
    • Focal length f = 391.86mm
    • Aperture: 2.88
    • Image height: 21.64mm
    • Lens length: 367.51mm
    • Back focus: 50.01mm
    • Lens design: 14 elements in 9 groups, two aspherical elements, one UD element
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