Canon Patents

Patent: Canon 55mm f/1.4 & Other Primes

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A few more patents for various “normal” fast prime optical formulas have appeared. Among them, another 35mm f/1.4 mention, as well as a 55 f/1.4. Read the entire patent to see the various optical formula images.

Patent Description (Google Translated)

  • Patent Publication No. 2014-123018
  • Publication date 2014.7.3
  • Filing date 2012.12.21
  • Image height = 21.64mm
  • Inner focus
Example Focal length Fno. Half angle The overall length of the lens BF MOD
One 49.53 1.45 23.60 99.46 38.10 450
Two 35.88 1.45 31.09 126.92 38.77 300
Three 55.42 1.45 21.33 100.44 40.24 450
Four 50.75 1.45 23.09 98.17 38.29 450

Source: [EG]

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