What do you mean by big aperture and small aperture?

Aperture is a device used to control the amount of light entering the photosensitive surface of the fuselage through the lens. Usually in the camera. The large aperture has a large amount of light and a deep scene. Small aperture has a small amount of light and a deep field of vision.

The specific applications of large aperture and small aperture in photography are as follows:

Large aperture (F 1.8 F2.4, etc. ) will make the background of the photo very blurred. Taking pictures of people, flowers and small things can give people a very artistic feeling.

Small aperture is suitable for taking group photos. When many people take group photos with cameras, they often can't see the people behind them clearly, only the people in front are clear. This is largely because the aperture is too large. We can turn down the aperture (such as F9.0 F 1 1) and shoot again.