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How PDAF Works?

Carl Fredrik Ahl
in Engineering

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Hi,

I understand the principle of how PDAF (Phase Detection Auto Focus) works. Look at the image I inserted. I don't understand how the incoming light splits into two rays of light in the two extreme sides of the lens. Why aren't lots of rays of light coming all over the lens?

Source: https://photographylife.com/how-phase-detection-autofocus-works

 

PDAF.png

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