https://www.cnet.com/news/iphone-x-and-a-dslr-have-more-in-common-than-we-thought/

The iPhone X, or any phone for that matter, can't replace a dSLR. But we wanted to find out if the camera on Apple's newest phone can even come close to the real thing.

The photographer can manipulate focus, aperture and distance of the lens from the subject on a dSLR to control depth of field. A shallow depth of field makes the subject look sharp relative to the background.