For a brief time—say, from Stieglitz through the reign of Weston—it appeared that a solid point of view had been erected with which to evaluate photographs: impeccable lighting, skill of composition, clarity of subject, precision of focus, perfection of print quality. But this position, generally thought of as Westonian—essentially technical criteria for what makes a photograph good—is now bankrupt. (Weston’s deprecating appraisal of the great Atget as “not a fine technician” shows its limitations.) What position has replaced Weston’s? A much more inclusive one, with criteria which shift the center of judgment from the individual photograph, considered as a finished object, to the photograph considered as an example of “photographic seeing.” What is meant by photographic seeing would hardly exclude Weston’s work but it would also include a large number of anonymous, unposed, crudely lit, asymmetrically composed photographs formerly dismissed for their lack of composition. The new position aims to liberate photography, as art, from the oppressive standards of technical perfection; to liberate photography from beauty, too. It opens up the possibility of a global taste, in which no subject (or absence of subject), no technique (or absence of technique) disqualifies a photograph.
— Susan Sontag, On Photography, 1977