Basic knowledge of photography and necessary skills for learning photography

1, focal length. The smaller the number, the shorter the focal length and the wider the viewing angle; The larger the number, the longer the focal length and the narrower the viewing angle.

2. Aperture. The smaller the value after f, the larger the aperture. The larger the value after f, the smaller the aperture. For example, F 1.4 is a large aperture and F 16 is a small aperture. The function of the aperture is to determine the amount of light entering the lens. The larger the aperture, the more light enters. On the contrary, the smaller. The amount of light entering is not only affected by the aperture of the lens, but also by the shutter speed of the camera. Under the condition of constant camera shutter speed: the larger the value after f, the smaller the aperture and the less light, and the clearer the subject of the scene. The smaller the value after f is, the larger the aperture is, the more light enters, and the front of the scene is clear and the back is blurred. This is called "depth of field".

3. Depth of field. The depth of field is actually the image formed after we focus on the subject in the range before and after focusing, and this range of distance before and after focusing is called "depth of field".