Canon EOS 5D Mark IV’s Dual Pixel RAW is for focus adjustment in postprocessing (new image and more detailed specs leaked) – updated with patent
Update #2: This may be the patent Dual Pixel RAW is based on (thanks lwestfall) https://www.canonwatch.com/canon-patent-combining-phase-detect-with-light-field-technology-for-accurate-auto-focus/ Scroll down for the Dual Pixel RAW discussion. Update: Digicame-info also posted a detailed specification…