Image sensors and optical devices

Which autofocus method uses some pixels of the image sensor to receive light from the left and right sides of the lens separately?

  1. AContrast AF
  2. BToF
  3. COn-sensor phase-detection autofocus
Show answer and explanation

Answer: C. On-sensor phase-detection autofocus

In on-sensor phase-detection AF, pixels in the image sensor separately receive light coming from the left and right (or top and bottom), and the amount and direction of defocus are determined from the offset between the two images. Unlike contrast AF, it does not need to search by moving the lens, so it focuses quickly.

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