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Canon Patent News - Canon 70-200mm F4

Canon is 70-200mm F4 patent is pending, the upcoming lens will feature better optics and advance IS system compared to the 70-200mm F4 Lens announced in 2006.

Take a look at the patent details below, (Translated by google)

Description and self-interpretation of the patent literature

  • 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

See more – Canon Patent News

src- egami

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