Circle of Confusion

The Circle of Confusion (CoC) refers to a concept in photography and optics that describes how a point of light, such as an object being photographed, is rendered as a blur when it is out of focus. Instead of appearing as a sharp dot on the camera sensor, it appears as a small circle. The size of this circle depends on factors like the distance from the camera, the aperture setting, and the focal length. Understanding CoC helps photographers control focus and depth of field, ensuring their images have the desired sharpness and clarity.