The enlargement or reduction of the aperture controls the amount of light passing through the lens.

The enlargement or reduction of the aperture can really control the amount of light passing through the lens. The enlargement or reduction of the aperture can really control the amount of light passing through the lens. When the aperture becomes larger, the opening between the blades becomes larger and the luminous flux increases, so that more light enters the lens; On the contrary, when the aperture is reduced, the opening between the blades becomes smaller, the amount of light passing through the lens decreases, and the amount of light entering the lens also decreases. By adjusting the size of the aperture, the photographer can obtain the required exposure effect under different light conditions. Aperture also affects the depth of field. A larger aperture will produce a shallower depth of field and blur the background; A smaller aperture will produce a larger depth of field and make the background clear. This is also the aperture effect that photographers often use when creating. The aperture size is inversely proportional to the aperture value (f value). That is, the smaller the f value, the larger the aperture and the more luminous flux; The larger the F value, the smaller the aperture and the less the luminous flux. Such as F 1. The aperture of 4 is larger than that of F2, and the luminous flux is more.