Your eye has long-ish depth of field. Your brain also compensates for focus. So you perceive an in-focus area several inches to many feet deep.
With an f1.2 lens, I can put objects just a few millimeters in the foreground and background of a subject out of focus.
Photographers, consciously or otherwise, use a language of optics effects to suggest ways of seeing, but they never work the same way as your vision system, which also lacks the ability to introspectively show you the raw data from your eye. So the saying that "your eye is a camera" is true, but the camera image is not directly accessible to your own mind.
So, somewhat ironically, this faux DoF effect might work more like your eye, putting a whole foreground object in sharp focus, and making the background uniformly "blurry."
With an f1.2 lens, I can put objects just a few millimeters in the foreground and background of a subject out of focus.
Photographers, consciously or otherwise, use a language of optics effects to suggest ways of seeing, but they never work the same way as your vision system, which also lacks the ability to introspectively show you the raw data from your eye. So the saying that "your eye is a camera" is true, but the camera image is not directly accessible to your own mind.
So, somewhat ironically, this faux DoF effect might work more like your eye, putting a whole foreground object in sharp focus, and making the background uniformly "blurry."