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Canon Patent For Variable Diffusion Focusing Screen (Update: looks like focus peaking in OVF)

Canon Patent

Thanks Wade for confirming my first thought.

Edit: it looks as if the technology described in the patent provides a sort of focus peaking in the optical viewfinder. Cool.

Egami (translated) spotted a patent filed by Canon for a variable diffusion focusing screen.

The technology in the patent highlights sharp areas and helps to see how much depth of field you have (for instance at larger apertures).

  • 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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