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Sunday, December 16, 2012

Canon Is Working On A Full Frame Mirrorless Camera?

EF 50mm f/1.2 lens design for full frame mirrorless DSLR ?

Our friends at Egami (Japanese Photography Blog) has discovered a patent from Canon Japan that suggest they are working on two new lens design, the EF 50mm f/1.2 and the EF 50mm f/2 that may be eventually mated to a full frame mirrorless camera. You can read the Google translation of the article from Egami.

Patent description :
Patent Publication No. 2012-247451
Release Date 2012.12.13
Filing date 2011.5.25

Example One

  • Focal length f = 51.70mm
  • Fno. 1.25
  • Half angle of view ? = 22.71 °
  • Image height 21.64mm
  • 105.65mm length lens
  • BF 40.00mm
  • Nine 6 groups lens configuration
  • One one aspherical surface
  • Maximum effective diameter 45.16mm

Example Four

  • Focal length f = 50.00mm
  • Fno. 2.06
  • Half angle of 23.40mm
  • Image height 21.64mm
  • Length 72.62mm lens
  • BF 28.86mm
  • Eight four group lens configuration
  • No aspherical
  • Maximum effective diameter 33.34mm

General symmetric lens

  • Compensation of magnification chromatic aberration can be
  • Difficult to correct axial chromatic aberration and the large-diameter

Canon patent

  • Symmetric lens large aperture
  • Positive, aperture, arranged in the order of the positive
  • Using a high anomalous dispersion glass, the axial chromatic aberration is corrected

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