Canon quad pixel af

Perhaps the seemingly never ending search for more pixels per inch is taking a back seat in the quest for greater focusing accuracy. Although why it is only for non FF sensors baffles me.
 
Perhaps the seemingly never ending search for more pixels per inch is taking a back seat in the quest for greater focusing accuracy. Although why it is only for non FF sensors baffles me.

It'll get there, Sony's fast ospdaf started out on apsc.
 
They mention "at the cost of lower MP sensors"... what they don't mention is that those pixels are missing from the image area.
The problem is/has been that the pixels used for PDAF are not used for image recording. And those gaps have to be filled in mathematically with "best guess" information, which then leads to striping issues and other errors.
 
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