What does aperture mean?

Aperture is a device used to control the amount of light entering the photosensitive surface of the fuselage through the lens, usually in the lens. We use the f value to represent the aperture size. Aperture f value = lens focal length/lens aperture diameter According to the above formula, to achieve the same aperture f value, the aperture of a long focal length lens is larger than that of a short focal length lens. The complete series of aperture values are as follows: F 1, F 1. 4, F2, F2 .8, F4, F5 .6, F8, F 1 1, F 16, F22, F32, F44, F64 What is worth discussing here is that the smaller the F value of the aperture, the more light enters per unit time, and the higher level advances. The aperture is a small circle on the camera lens, which can be large or small, and the photographer can control its size. 2. What's the use of the aperture? Obviously, the larger the aperture, the more light will enter the camera. Everyone will understand when they see this. Take pictures when the light is dim. A bigger aperture is better. 3. The meaning of aperture number. Aperture is represented by f value: f2.8 f4 f5.6 f8 f 1 1 ... and so on. 4. Aperture can also control the depth of field. A large aperture can get a small depth of field. A small aperture can get a large depth of field. You probably understand that to get the effect of clear subject and blurred foreground background, using a large aperture can help you pull ~ the correct exposure requires the correct combination of shutter and aperture. When the shutter is fast, the aperture will be larger; The aperture is smaller when the shutter is slow. When the shutter is reduced by half, the aperture increases by a step, which is the reciprocal rate. Automatic metering is to use such a standard to set such a combination to get the correct exposure. Similarly, when one of the parameters is fixed, according to the principle of constant exposure, the other parameter will also change to keep the exposure constant. Therefore, when the shutter time is actively adjusted and the aperture is determined by the camera, it is called shutter priority mode. On the contrary, when the aperture is actively adjusted and the camera sets the shutter, it is called aperture priority mode. Both of them are called programmed exposure mode (P) by camera timing and manual mode (M) by photographers. Of course, the standard that the camera thinks is not necessarily accurate. Using three semi-automatic shooting methods, when you feel underexposed or overexposed, you can adjust the exposure compensation, and the camera will change the exact exposure ratio it thinks to meet the needs of photographers. Due to the limited compensation range, if the compensation setting cannot be solved, the appropriate parameter configuration can only be adjusted manually.