What is the purpose of SLR large 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 lens. Function: 1. Determine the optical input of the lens. The larger the aperture, the more light enters, the narrower the focal plane, and the more blurred the background of the subject. On the other hand, the smaller the aperture, the less light enters, the darker the picture, the wider the focal plane and the clearer the subject. 2. Aperture is the most important factor to determine the depth of field. The aperture is large and the scene is deep. On the contrary, the aperture is small and the scene is deep.

SLR cameras using large aperture photography will blur the background of photos, highlight the main body, and reflect an artistic conception, which is suitable for taking portraits, flowers and so on.