![]() ![]() Diffraction effects from wave optics and the finite aperture of a lens determine the circle of least confusion the more general usage of 'circle of confusion' for out-of-focus points can be computed purely in terms of ray (geometric) optics. The term circle of confusion is applied more generally, to the size of the out-of-focus spot to which a lens images an object point. Recognizing that real lenses do not focus all rays perfectly under even the best conditions, the term circle of least confusion is often used for the smallest blur spot a lens can make, for example by picking a best focus position that makes a good compromise between the varying effective focal lengths of different lens zones due to spherical or other aberrations. The smallest circle that they pass through C is called the circle of least confusion.įor describing the blur spot achieved by a lens, at its best focus or more generally. In an imperfect lens L, not all rays pass through a focal point.Two important uses of this term and concept need to be distinguished: The smallest such spot that a lens can produce is often referred to as the circle of least confusion. Real lenses do not focus all rays perfectly, so that even at best focus, a point is imaged as a spot rather than a point. Usages in context include maximum permissible circle of confusion, circle of confusion diameter limit, and the circle of confusion criterion. A standard value of CoC is often associated with each image format, but the most appropriate value depends on visual acuity, viewing conditions, and the amount of enlargement. In photography, the circle of confusion is used to determine the depth of field, the part of an image that is acceptably sharp. It is also known as disk of confusion, circle of indistinctness, blur circle, or blur spot. In optics, a circle of confusion (CoC) is an optical spot caused by a cone of light rays from a lens not coming to a perfect focus when imaging a point source. ( Learn how and when to remove this template message)ĭiagram showing circles of confusion for point source too close, in focus, and too far Consider transferring direct quotations to Wikiquote or, for entire works, to Wikisource. Please help improve the article by presenting facts as a neutrally worded summary with appropriate citations. This article contains too many or overly lengthy quotations for an encyclopedic entry.
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