Variable Diffusion Focusing Screen developed by Canon to get patent



As we all know that the currently available DSLR’s manual focusing system is quite hard to work with while using fast primes with default focusing screen. Just to tackle this problem canon came with a new variable diffusion focusing screen. Further canon has applied to get its new focusing technique patent. The patent reveals a focusing screen capable of displaying sharp areas while giving the user better idea of 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

source: Canonrumor

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