The field of view (also field of vision) is the angular extent of the observable world that is seen at any given moment. J-pop is an abbreviation of Japanese pop. It refers to Japanese popular musicians and was coined by the Japanese media to distinguish Japanese musicians from foreign musicians The field of view (also field of vision) is the angular extent of the observable world that is seen at any given moment In Geometry and Trigonometry, an angle (in full plane angle) is the figure formed by two rays sharing a common Endpoint, called In Psychology, visual perception is the ability to interpret information from Visible light reaching the Eyes The resulting Perception is also

Different animals have different fields of view, depending on the placement of the eyes. Eyes are organs that detect Light, and send signals along the Optic nerve to the visual areas of the brain Humans have an almost 180-degree forward-facing field of view, while some birds have a complete or nearly-complete 360-degree field of view. In addition the vertical range of the field of view may vary.

The range of visual abilities is not uniform across a field of view, and varies from animal to animal. For example, binocular vision, which is important for depth perception, only covers 140 degrees of the field of vision in humans; the remaining peripheral 40 degrees have no binocular vision (because of the lack of overlap in the images from either eye for those parts of the field of view). Binocular vision is vision in which both Eyes are used together Depth perception is the visual ability to perceive the world in three Dimensions Although any animal capable of moving around its environment must be able to The aforementioned birds would have a scant 10 or 20 degrees of binocular vision.

Similarly, color vision and the ability to perceive shape and motion vary across the field of view; in humans the former is concentrated in the center of the visual field, while the latter tends to be much stronger in the periphery. Color vision is the capacity of an organism or machine to distinguish objects based on the Wavelengths (or frequencies) of the Light they reflect or emit This is due to the much higher concentration of color-sensitive cone cells in the fovea, the central region of the retina, in comparison to the higher concentration of motion-sensitive rod cells in the periphery. Cone cells, or cones, are Photoreceptor cells in the Retina of the Eye which function best in relatively bright Light. The fovea, also known as the fovea centralis, is a part of the Eye, located in the center of the Macula region of the Retina. The vertebrate retina is a light sensitive part inside the inner layer of the Eye. Rod cells, or rods, are Photoreceptor cells in the Retina of the Eye that can function in less intense Light than can the other type Since cone cells require considerably brighter light sources to be activated, the result of this distribution is that peripheral vision is much stronger at night relative to binocular vision.

Conversions

Many optical instruments, particularly binoculars or spotting scopes, are advertised with their field of view specified in one of two ways: angular field of view, and linear field of view. Angular field of view is typically specified in degrees, while linear field of view is a ratio of lengths. For example, binoculars with a 5. 8 degree (angular) field of view might be advertised as having a (linear) field of view of 305 feet per 1000 yards or 102 mm per meter. This article describes the unit of angle For other meanings see Degree. As long as the FOV is less than about 10 degrees or so, the following approximation formulas allow one to convert between linear and angular field of view. Let A be the angular field of view in degrees. Let L be the linear field of view in feet per 1000 yards. Let M be the linear field of view in millimeters per meter. Then:

Astronomy

In astronomy the field of view is usually expressed as an angular area viewed by the instrument, in square degrees, or for higher magnification instruments, in square arc-minutes. A minute of arc, arcminute, or MOA is a unit of angular measurement, equal to one sixtieth (1/60 of one degree. For reference the Wide Field Channel on the Advanced Camera for Surveys on the Hubble Space Telescope has a field of view of 10 sq. The Advanced Camera for Surveys (ACS is a third generation axial instrument aboard the Hubble Space Telescope (HST The Hubble Space Telescope ( HST; also known colloquially as "the Hubble" or just "Hubble" is a space telescope that was carried into arc-minutes, and the High Resolution Channel of the same instrument has a field of view of 0. 15 sq. arc-minutes. Ground based survey telescopes have much wider fields of view. The photographic plates used by the UK Schmidt Telescope had a field of view of 30 sq. The 12 Metre UK Schmidt Telescope (UKST is operated by the Anglo-Australian Observatory, and located adjacent to the 3 degrees. The 1. 8 m (71 in) Pan-STARRS telescope, with the most advanced digital camera to date has a field of view of 7 sq. Pan-STARRS (an Acronym for Panoramic Survey Telescope And Rapid Response System is a planned astronomical survey that will conduct Astrometry and Photometry degrees. In the near infra-red WFCAM on UKIRT has a field of view of 0. UKIRT, the United Kingdom Infra-Red Telescope, is a 38 metre (150 inch Infrared reflecting telescope the largest dedicated infrared (1 to 30 micrometre 2 sq. degrees and the forthcoming VISTA telescope will have a field of view of 0. VISTA is the Visible & Infrared Survey Telescope for Astronomy a 4 6 sq. degrees. Until recently digital cameras could only cover a small field of view compared to photographic plates, although they beat photographic plates in quantum efficiency, linearity and dynamic range, as well as being much easier to process. Quantum efficiency (QE is a quantity defined for a photosensitive device such as Photographic film or a Charge-coupled device (CCD as the percentage of Photons

See also

• Perimetry
• Peripheral vision
• Visual perception