Acuity is a photographic term used to describe the perceived visual sharpness and clarity of an image. It refers to how well fine details, edges, and textures are rendered, and is influenced by factors such as lens quality, focus accuracy, aperture settings, camera stability, and the resolving power of film or digital sensors. High acuity results in crisp, detailed images, while low acuity can make photos appear soft or blurred. Understanding and controlling acuity is essential for photographers aiming to produce professional-quality images, whether in portrait, landscape, macro, or architectural photography.