They both allow the photographer to adjust the amount of light that passes through the lens. To explain in Layman’s terms, an aperture in a camera is like a pupil in the human eye. As you transition between dark and bright environments, the size of your pupil either expands or shrinks accordingly. The same concept can be applied to an aperture. A photographer can enlarge or shrink the size of the aperture to either allow more or little light to reach the sensor of the camera.
The aperture can be described as the size of the lens opening and is made from aperture blades that control the size of the opening (f/stop number). Some typical openings are 3.5, 4.0, and above. As the f/stop number decreases in size and becomes smaller, the opening in the aperture of the lens increases in size and becomes larger. As a result, we get a brighter photograph. However, a larger f/stop number does quite the opposite and as a result, you get a darker photo.
