[Patent] Canon Files Patent For A New 35mm f/1.4 Prime Lens

Egami (machine translated) spotted a new Canon patent. This time it is for a 35mm f/1.4 prime lens. The existing EF 35mm was released in 1998, so it makes sense for Canon to work on a new release of this lens. According to Egami, it looks as if Canon has been working since four years on this lens.

Details (machine translated):

  • Patent Publication No. 2012-123155
    • 2012.6.28 Release Date
    • 2010.12.8 filing date
  • Example 1
    • Focal length f = 34.73mm
    • Fno. 1.45
    • Half angle of 31.92 deg.
    • Image height 21.64mm
    • Length 128.11mm lens
    • 38.48mm back focus
    • An effective diameter of 52.03mm lens
    • Effective diameter aperture 25.52mm
    • Lens Construction 12 elements in 9 groups sheet
    • 2 2 aspherical surface
  • Retrofocus
    • And retro focus lens optical system focal length is shorter than the length of the optical system
    • Increasingly asymmetric refractive power arrangement must be strengthened a negative refractive power of the front group in particular
      • Coma aberration, astigmatism, spherical aberration occurs
    • Order to secure a back focus must be to increase the ratio retro
      • Pettsuvu~aru sum is reduced and off-axis aberration (field curvature, distortion) is worse

 

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