On aperture in photography

Aperture, also known as diaphragm, is a device used to control the amount of light entering the photosensitive surface of the fuselage through the lens. Usually in the camera. We use the f value to represent the aperture size. For the manufactured lens, we can't change the diameter of the lens at will, but we can control the luminous flux of the lens by adding a polygon or circular aperture grating with variable area inside the lens. This device is called an aperture. Its size determines how much light enters the photosensitive element through the lens. We use f value to represent the aperture size, where F= lens focal length/lens effective aperture diameter. Aperture f value = lens focal length/lens aperture diameter.

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The complete series of aperture values are as follows: f 1.0, f 1.4, f2.0, f2.8, f4.0, f5.6, f8.0, F1,f 16, F2. The smaller the value after f, the larger the aperture. The function of the aperture is to determine the amount of light entering the lens. The larger the aperture, the more light enters. On the contrary, the smaller. Simply put, under the condition of constant shutter, the larger the aperture, the more light enters and the brighter the picture; The smaller the aperture, the darker the picture.