Can a great god popularize the basic knowledge of photography?

1. It can adjust the amount of light entering the lens. For example, the pupil of a domestic kitten always shrinks into a line during the day, and automatically Zhang Kaicheng a round hole at night. So in the same way, when taking pictures, the aperture should be narrowed when the light is strong, and the aperture should be opened when the light is dark. That is to say, the smaller the F value (other parameters remain unchanged), the more favorable it is for shooting at night.

2. Aperture is the most important factor to determine the depth of field, with large aperture, small depth of field, small aperture and large depth of field! For example, nearsighted friends, if they don't wear glasses, always habitually squint at things, so they can often see things clearly. To use photographic terminology, this is called: narrowing the aperture (pupil) and increasing the depth of field!

Why do we often see some beautiful pictures with blurred background? This is closely related to the large aperture. The larger the aperture, the more blurred the background.