Interpretation of terms in photography: how to explain the theme, photographic composition, subject, partner, focal length, news photography and side backlight?

Theme: It can be understood as the main content or central idea of a work.

Photographic composition: applying the theory of traditional Chinese painting, it is the composition and layout of a photographic work. In layman's terms, it refers to the structure of the work, that is, the artistic, true and reasonable arrangement and combination of all kinds of scenery within the range of shooting, so as to make it in line with the theme.

Subject: It is the core of photographic composition, and the main object for the audience to receive information and education.

Foil: it is a foil to the main body, which can be understood as foreground and background.

Focal length: divided into back focal length and front focal length. The distance from the main point H' of the lens to the focal point F' of the lens is called the focal length of the image, also called the back focal length; The distance from the main point H of the lens to the focal point F of the lens is called the focal length of the object, also called the front focal length.

News photography: news reports on the events that are happening and should be noticed through snapshot photography.

Side backlight: Also known as backlight level, the light emitted from the back of the camera on the left and right sides of 135 directly hits the subject.