Focus at infinity refers to the point where an object or image appears to be at an infinite distance. This term is commonly used in photography and optics, where cameras and lenses are adjusted to ensure that distant objects are in sharp focus. Synonyms for focus at infinity could include "infinite focus," "hyperfocal distance," or "far focus." Other related terms might include "depth of field," which refers to the range of distances that appear in sharp focus in an image, or "focus distance," which refers to the actual distance from the camera to the subject being photographed. Regardless of the terminology used, achieving focus at infinity is a crucial component of many different photographic and optical applications.