When blurring is used in this way it's known as bokeh. Subject The subject of a photograph is what it's all about. In most images it needs to be in focus. Depth of field Everything in this area ...
Regardless, these bokeh camera settings on film or digital will produce images with shallow depth of field – which means only a narrow plane of your photo will be in focus, with the background ...
The greater the depth of field, the easier it is to produce bokeh. As anyone who has taken a deep dive into the world of photographic lenses can attest, the hunt for the best bokeh is never-ending.