The latest iPhones fake this in Cinematic filming mode. They use depth info and a long depth of field, then apply a distance based Gaussian blur to fake a shall

The latest iPhones fake this in Cinematic filming mode. They use depth info and a long depth of field, then apply a distance based Gaussian blur to fake a shallow DOF in post. But you can go back and edit footage, selecting other subjects than what was “focused on” during filming.