aperture definition in photography
aperture ap·er·ture (āp'ər-chər) n. An opening, such as a hole, gap, or slit. A usually adjustable opening in an optical instrument, such as a microscope, a camera, or a telescope, that limits the amount of light passing through a lens or onto a mirror. The diameter of such an opening. The diameter of the objective of a telescope or microscope. Definition of critical aperture - iDigitalPhoto Dictionary. Definition: The aperture setting which gives the best overall performance. * The relative aperture at which an optical system delivers the best balance between aberration correction and contrast rendition. Stop stopping down two. The commonest advice for using critical aperture was to stop down two stops from maximum: this continues to be useful for standard lenses of modest aperture and enlarging lenses, but not for other types. In optics, an aperture is a hole or an opening through which light travels. More specifically, the aperture and focal length of an optical system determine the cone angle of a bundle of rays that come to a focus in the image plane. Aperture is measured using something called the f-stop scale. On your camera, you’ll see ‘f/’ followed by a number. The number denotes how wide the aperture is which, in turn, affects the exposure and depth of field (also tackled below) – the lower the number, the wider the aperture. A device that controls the amount of light admitted through an opening. In photography and digital photography, aperture is the unit of measurement that defines the size of the opening in the lens that can be adjusted to control the amount of light reaching the film or digital sensor. The size of the aperture is measured in F-stop. See also shutter speed. The most popular Webopedia definitions of 2015. Java is a high-level programming language. This guide describes the basics of Java, providing an overview of syntax, variables, data types and... This second Study Guide describes the basics of Java, providing an overview of operators, modifiers and control Structures. The size of a change in aperture correlates with the exposure: the larger the aperture, the more exposed the photo will be. The best way to demonstrate this is by taking a series of photos, keeping everything constant, with the exception of the aperture. Say, for example, you have a 50mm lens with the aperture of f2. To find the width of the aperture, you divide the 50 by the 2, giving you a diameter of 25mm. You then have to take the radius (half the diameter), times it by itself (giving the radius squared) and times that by pi. An aperture is an opening, usually a small one. “If you can thread the silk through that aperture and pull it out the other side, we can knot it and create a loop.”. The most common place you’ll find aperture is when you’re talking about cameras or photography. In that case, an aperture refers specifically to the hole or opening in the lens that lets light through, which you can adjust (with the f-stop) to let in more or less light, resulting in a shallow or deep range of focus. The best way to understand aperture is to think of it as the controls for the pupil of an eye – the wider it gets, the more light it lets in. Together, the aperture, shutter speed and ISO produce an exposure. The diameter of the aperture changes, allowing more or less light onto the sensor depending on the situation.
An opening, such as a hole, gap, or slit.