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A patent for a variable diffusion focusing screen from Canon is out there. The patent shows a focusing screen capable of showing sharp areas as well as giving the shooter a better idea of depth of field. Current DSLRs are quite difficult to manually focus accurately using fast primes with the default focusing screens. There are focusing screens out there you can swap out, but having it all in one screen would be ideal.
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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