A patent showing an improved AF accuracy concept has appeared, and Northlight has shed some light on what it's all about.

It's a way of improving detection of AF errors without changing the lens focus, as in the ‘hunting' that Contrast AF does. Uses polarising filters on a plate in front of the pixels. More a concept than practical design here.

Patent Publication No. 2016-24391 (Google Translated)

  • Published 2016.2.8
  • Filing date 2014.7.23
  • When placed near squeezed retarder phase difference changes toward the periphery from the center, and a linearly polarized light having a vertical plane of vibration, the focus position of the direct polarized light having a horizontal oscillation plane deviates
  • Place the linear polarizer between the optical system and the imaging device, and polarization selection means

We're still looking for patents to shed some light on Canon's mirrorless future, especially how they're going to make EF lenses “native” with a future full frame mirrorless body.

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