Depth of field (DOF) refers to the range of distances that appear sharp in an image. A narrow DOF isolates the subject from the background by blurring the latter, drawing attention to the subject. Achieving a narrow DOF is a sought-after technique in photography, particularly in portraiture, macro photography, and product photography.
There are several advantages to using a narrow DOF. It can create a sense of depth and dimension, making the subject stand out from the background. A narrow DOF can also be used to isolate a specific part of the subject, such as the eyes or hands. Additionally, a shallow DOF can create a more aesthetically pleasing image by reducing visual clutter and distractions.