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Are These Canon Lens Patents For The EOS M System?

35mm f/1.4
50mm f/1.4
50mm f/1.8

Egami (translated) spotted Canon patents for three lenses that could been thought for the EOS M mirrorless system, a 5omm f/1.8, 50mm f/1.4 and 35mm f/1.4. Egami’s analysis of the patents suggests this interpretation, i.e. that these lenses are made for an APS-C mirrorless system. Sound exciting, having such primes for the EOS M would at least allow us to think that Canon is committed to their mirrorless system. More details and specs after the break.

  • Patent Publication No. 2013-218015
    • Publication date 2013.10.24
    • Filing date 2012.4.5
  • Example
    No. Focal length Fno. Half angle The overall length of the lens BF
    One 36.00 1.45 20.78 67.20 17.32
    Three 51.00 1.45 14.99 87.56 27.55
    Five 50.00 1.80 15.28 68.51 26.50

    Image height = 13.66mm

  • Canon patent
    • Positive and negative aperture positive
    • Front group feeding (Front Focus) + floating
    • Only Example 5, the entire feed (Unit Focus)
    • Special glass material
      • I to have an abnormal partial dispersion and high dispersion
      • The product including the inorganic oxide resin
      • To reduce the chromatic aberration
    • 0.5 times maximum magnification
35mm F1.4 50mm F1.4 50mm F1.8
EF-M 35mm F1.4 STM EF-M 50mm F1.4 STM EF-M 50mm F1.8 STM

From left to right, the spherical aberration, astigmatism, distortion, lateral chromatic aberration. From top to bottom, infinity, when β = -0.25, of β = -0.50.


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