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Sunday, January 11, 2015

Canon Patent : CN-E 35-260mm f/2.8 Soft Focus Lens

The Japanese photography blog, Egami, has discovered a new Canon patent for a zoom Cinema lens with a soft focus. This brings back memory of the 1980s when I owned the Canon EF 135mm f/2.8 Soft Focus lens. It was not an expensive lens and also not a top performer but it did the trick and produced images with a soft, slightly blurry look to it, the kind you see in Boudoir photography.

If this design ever gets into production, I anticipate it to be an expensive lens. Canon is placing a lot of emphasis and high hopes on the Cinema EOS line of cameras and lenses. They expect it to be a very successful line for them in the years to come.

Patent Publication No. 2014-235203 (Google Translated)

  •     Published 2014.12.15
  •     Filing date 2013.5.31

Example 3

  •     Zoom ratio 7.50
  •     The focal length f = 34.00-68.00-102.00-136.00-254.99mm
  •     Fno. 2.70
  •     Half angle ? = 24.58-12.88-8.67-6.52-3.49 °
  •     Image height Y = 15.55mm
  •     Overall length of the lens 441.54mm
  •     BF 51.02mm

Canon patent

  •     4-group zoom of positive and negative negative-positive
  •     Spherical aberration adjustment group (soft focus)
  •     Not shift the focus position can be switched to soft focus

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