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Monday, July 11, 2016

Canon Patent Improves Detection of Auto Focus Errors

New Canon patent uncovered by Egami aims to enhance Auto-Focus accuracy by improving the detection of errors and reducing 'AF hunting.' The method is in its experimental stage and involves adding polarizing filters in front of the sensor.

Currently, Canon's most advanced AF system is found on the EOS-1D X Mark II camera. Since May, I have taken delivery of the new DSLR and have traveled to global locations, ranging from the Amazon to the high Arctic, testing the new features and functions of this body in real world environment. You can read my review here. Recently, DXOMark also tested the camera and gave it one of its highest ranking.

Patent Publication No. 2016-24391

  • Published 2016.2.8
  • Filing date 2014.7.23
  • Example 1
  • Zoom ratio 1.00
  • Focal length 293.46
  • F-number 2.93
  • Half angle of view (degrees) 4.22
  • Image height 21.63
  • Overall length of the lens 274.0
  • BF 59.13
  • 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

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