Aperture: The Camera Setting That Controls Light and Background Blur

Think of aperture as the camera’s “pupil”: an opening inside the lens that widens or narrows to control how much light reaches the sensor. Aperture size is described using f-numbers (like f/1.8, f/5.6, f/16). Here’s the part that often feels backwards at first: The diagram below shows how the opening changes as the f-number changes. …