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Canon Patent For 100-400mm f/4.5-5.6 Lens

100-400mm f/4.5-5.6

Egami (translated) spotted a patent for a 100-400mm f/4.5-5.6 lens with diffractive optical elements. We saw other patents for a 100-400mm in the past. The patent refers also to a 70-300mm  f/4.5-5.6 lens.

Is this the patent for the replacement for the Canon EF 100-400 f/4.5-5.6L IS? Don’t think so, since the patent refers to a lens without IS. Just recently a rather weak rumor surfaced suggesting that the EF 100-400 f/4.5-5.6L IS replacement could be the next “L” lens Canon is going to announce, the latest rumor in a long series for this lens that hopefully will be seen one day.

  • Patent Publication No. 2014-89385
    • Publication date 2014.5.15
    • Filing date 2012.10.31
  • Example 1
    • Zoom ratio 3.78
    • Focal length f = 103.00-200.00-388.94mm
    • Fno. 4.63-5.24-5.83
    • Half angle ω = 11.86-6.17-3.18 °
    • Image height Y = 21.64mm
    • 228.82-273.58-303.10mm total length
    • BF 69.48-90.93-105.73mm
  • Example 6
    • Zoom ratio 4.00
    • Focal length f = 72.50-135.00-289.99mm
    • Fno. 4.44-5.04-5.85
    • Half angle ω = 16.62-9.10-4.27 °
    • Image height Y = 21.64mm
    • 143.91-177.69-203.15mm total length
    • BF 39.10-39.10-39.10mm
[via Egami]
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