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

• 12 years ago
• Categories: Canon
• Tags: Canon EF 600mm f/4 DO BR lens, Patents

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