PDAF has nothing to do with the sensor itself, it's just a different micro lens filter. You could make on-sensor PDAF happen even with an old CCD.
Wrong....
on sensor PDAF is integrated as a second layer of a sensor behind the image capturing front layer. The light actually hit the imaging photosite layer FIRST, then passes through to the PDAF layer. Which means the the imaging photosites are the ones that passes light through.
So tell me, in this design, how can you make this happen for an old CCD? because last time I remember CCD sensor array is opaque.
sensors with on sensor PDAF is a complete unit design. The PDAF is not some bolted on magical micro lens piece. It is a complete semiconductor unit designed. the layers are built like any semiconductor layers.
Try to read up and understand the technology before making nonsensical statements like these.
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