What effect does aperture value have on photography?

At present, the aperture in daytime photography is mainly used to control the depth of field (unexpected clear range of focal plane). The larger the aperture (here, the smaller the depth of field), the stronger the defocusing effect outside the focal plane (hereinafter referred to as Jiao Wai), which is suitable for highlighting the subject on the focal plane. And now most of them are F-apertures, and the aperture here will produce a secondary phenomenon, that is, when the Jiao Wai light ratio is strong, there will be obvious light spots, which will have a good effect if used well. Then, because the aperture size will affect the amount of light entering, the larger the aperture, the more light entering, which is very important for low-light shooting. Usually the maximum aperture of the lens is 3.5, the professional zoom is 2.8, and the Jiao Da part is still 1.4. Through the above, the larger the aperture, the smaller the depth of field and the more light, the more dramatic the photos will be. Therefore, every level of aperture lens is basically thousands or even tens of thousands more expensive.

Generally, the aperture is the maximum aperture, such as F 1.4, F2, F2.8, F3.5, F4.5, F5.6, F8, F9, F 10, F 14, F 16 and F22, where Full aperture is often used, for example, photographers often use an aperture above 2.8. After F22, small aperture is rarely used (generally used for time-lapse photography).

The landlord said to shoot the moon, but actually not seeing it doesn't mean there is no interference. Generally speaking, you shoot from the ground, which is far from the moon. This kind of interference is still a lot (the most important interference in the atmosphere). However, the shooting process is mainly focusing and image quality. Because of the current lens technology problems, the imaging of the maximum aperture will deteriorate after the focusing distance exceeds a certain distance. Therefore, in order to pursue the clarity of the picture, the aperture will be lowered, and celestial bodies will generally receive F 10 or so.