A PC, or Perspective Control lens, is also known as a shift lens. It features a front element that can slide up or down from its normal position, allowing photographers to correct converging vertical lines when shooting from high or low angles. Some models also include a swing function, which adjusts the plane of focus to control depth of field according to the Scheimpflug principle.
PC lenses are commonly used in architectural, interior, and product photography, where maintaining straight lines and precise perspective is crucial. They provide greater creative control over composition and focus, enabling professional results in challenging shooting conditions.