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
