Aperture The aperture is the "Pinhole Size".The aperture is the opening in a lens through which light enters.Its diameter is controlled by a diaphragm, and its size is described by an f-number (f/stop).A smaller f-number (like f/2.8) means a larger opening, allowing more light.A larger f-number (like f/16) means a smaller opening, allowing less light.The f-stops follow a logarithmic scale, where..
