Aperture in photography refers to the opening in a camera lens through which light passes to enter the camera and reach the image sensor

. It is expressed in f-numbers like f/1.4, f/2, f/2.8, and so on, to express the size of the lens opening, which can be controlled through the lens or the camera

. A smaller aperture means less light is transmitted through the lens, while a larger aperture will let in more light

. Aperture can be adjusted to control the amount of light that reaches the camera sensor, and it affects the depth of field, sharpness, and exposure of the image

. A wider aperture (lower f-stop number) results in a shallower depth of field, while a narrower aperture (higher f-stop number) results in a deeper depth of field

. The aperture of a lens is expressed as an f-number or f-stop, which is produced by dividing the lens's focal length by the physical diameter of the entrance pupil