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Wednesday, October 15, 2014

Canon Patent - Variable Diffusion Focusing Screen

The Japanese photography blog, Egami has discovered a patent filed by Canon for a variable diffusion focusing screen. The technology in the patent highlights sharp areas and helps to determine the depth of field.

Patent Publication No. 2014-191184

  • Published Date 2014.10.6
  • Filing date 2013.3.27

Canon patents

  • Spreading factor variable finder screen
  • First diffusion rate
  • Brightness priority
  • Setting of low diffusivity and high transmittance
  • Second diffusion rate
  • Blur priority
  • Setting of high diffusivity and low transmittance
  • The partially changed spreading factor according to the focusing range

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