It is merely a stance against photography being used to imitate other art forms, and an assertion that the purity of the photographic image is, in itself, the art form of the photographic process, accentuated by the optical qualities of the lens, I believe AA used the term "straight photography" in the writings. Not to be confused with a "straight print" made without any dodging and burning, the phrases are not at all to be used interchageably.