Halation is a term that refers to the phenomenon where light appears to bleed or blur into the image formed by a camera lens. Some common synonyms for halation include optical flare, lens flare, and ghosting. Other related terms include bloom, which describes a similar effect where light appears to expand beyond its source, and bokeh, which describes the aesthetic quality of the out-of-focus areas in an image. Different types of halation may be caused by various factors, such as the quality of the lens, the angle and intensity of the light source, and the settings of the camera. Understanding these terms can help photographers and cinematographers create more visually captivating imagery.