What are the characteristics of pure photography?

Steichen, Cash, etc. Members of the separatists are opposed to making photos by painting and advocate pure photography, which is pure photography. Pure photography is based on the independence of photographic language, pursues the visual reproduction of objective images, and emphasizes the "purity" of photographic noumenon characteristics to realize its own value. As far as the characteristics of artistic photography are concerned, the biggest difference between it and realistic photography is that the "purity" of pure photography includes non-social and subjective emotional expression that pays attention to artistic expression. The realistic concept of pure photography still has an important influence on today's photography. In the 1920s, pure photography completely replaced picturesque photography and became a mainstream of artistic photography.