Dual PDAF Focusing Technology
The R9 series, released in 2016, introduced OPPO's IMX398 image sensor. Co-developed with Sony, the IMX398 was an image sensor redesigned from the ground up, adopting Dual PDAF (phase detection autofocus) technology to double the size of each focusing pixel. This improved focus speed by 40 percent, greatly reducing the chances of taking blurry photos.