Differential focusing is a photographic technique in which the camera's focus and aperture are adjusted to create a minimal depth of field. This ensures that only a specific subject or element in the scene remains sharply in focus, while the foreground and background gradually blur.
This technique is commonly used in portrait, macro, and product photography to isolate the subject from distractions and draw the viewer's attention precisely where the photographer intends. By carefully controlling focus and aperture, differential focusing adds depth, dimension, and a professional, artistic quality to images.