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Plano focal .
| Глоссарий по архивному хранению медийных материалов |
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Focal plane, английский
- Focal plane. a shutter that opens and closes near to the film or image sensor, usually as a fast-moving slit, as contrasted with a bladed/leaf shutter located near a nodal point of a lens.
- A plane (through the focal point) at right angles to the principal point of the lens.
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Focal atelectasis, английский
Focal communication center, английский
Focal distance, английский
Фокусное расстояние
Focal epilepsy, английский
Epilepsy arising from a localised area of the brain
Focal infection, английский
Infection in which the pathogen causes infection in one location that then spreads to a secondary location
Focal length, английский
- The distance between the optical centre of a lens and the focal point.
- Положение главной задней плоскости зависит от типа объектива: у нормальных объективов она находится недалеко от диафрагмы, у телеобъективов она расположена перед линзами, а у объективов с удлинённым главным отрезком - сзади них. поэтому главное фокусное р
- Imaging device size
- The distance between the center of a lens, or its secondary principal point and the imaging sensor. lower lengths give a greater field of view and less magnification. longer lengths give a narrower field of view and greater magnification. the table below gives an approximate value for the angle of the field of view for lenses of various focal lengths and also considering the size of the imaging device (ccd). most cctv cameras have one of the 3 sizes of imaging devices listed below, 1/4", 1/3" or 1/2". almost all of cctv camera pros cameras have 1/3" sony ccd imaging devices.
- Of a lens, the distance from the focal point to the principal point of the lens.
- The distance from the center of the lens to a plane at which point a sharp image of an object viewed at an infinite position. the focal length determines the size of the image and angle of field of view seen by the camera through the lens. this is the center of the lens to the image pickup device.
- The distance between the optical center of a lens and the principal convergent
- The distance from the center of the lens to a plane at which point a sharp image of an object viewed at an infinite position. the focal length determines the size of the image and angle of fov seen by the camera through the lens. this is the center of the lens to the image pickup device.
- Distance between the optical center of a lens and the image focal point. fixes the magnification and the angle of view of a lens. vari-focal and zoom lenses have a variable focal length.
- A lens` angle of view, most commonly indicated as wide angle, normal or telephoto. usually compared to a 35mm camera`s lenses as in the camera has a wide angle lens equivalent to a 38mm lens on a 35mm camera. see also zoom lens
- The distance between the optical center of a lens and the principal convergent focus point.
- Distance between the center of a lens and the point on the optical axis to which parallel rays of light are converged by the laser.
- A measure of how strongly an optical system focuses or defocuses light
- The distance from the lens to the film plane or sensor that focuses light at infinity. the length, expressed in millimeters, is more useful as an indication of the angle of view of a particular lens. a shorter focal length lens, such as a 28mm, offers a wider angle of view than a longer one, such as 100mm.
- A lens’ angle of view. such as wide angle, standard or telephoto.
- The distance from the back vertex of a lens to its focal point.
- The distance between the object-glass and the eye-piece of a telescope.
- The distance between the camera’s lens and the image plane. focus (n)
- The distance from the lens to the image point when the object is at a definite distance from the lens (this is also the distance to the focal point)
Focal length, английский
Focal length (camera lens), английский
The lens-to-focal-plane distance at the infinity setting. focal length affects shooting distance, which affects perspective. see: angle of view.
Focal length magnifier, английский
Also known as magnification factor or crop factor, this term is used to describe the angle of view (aov) of a lens used on a dslr in relation to how it would appear on a full-frame 35mm camera. as an example, compact dslrs contain sensors that are about 50% smaller than a standard 35mm frame. as a result, the effective focal length and aov of a 50mm lens on a compact dslr would be reduced, or cropped to the equivalent of a 75mm lens. canon eos rebels and other compact canon dslrs have a 1.6x magnification factor, which would make a 50mm lens effectively an 80mm lens. for more on this subject, see the eplora article, “understanding crop factor.”
Focal myopathy, английский
Destruction of muscle tissue caused by a substance injected in an intramuscular injection
Focal plane, английский
- Focal plane. a shutter that opens and closes near to the film or image sensor, usually as a fast-moving slit, as contrasted with a bladed/leaf shutter located near a nodal point of a lens.
- A plane (through the focal point) at right angles to the principal point of the lens.
Focal plane array, английский
Focal plane array. a matrix of sensors positioned in the focal plane of a lens or other focusing device.
Focal pneumonia, bronchopneumonia, английский
Focal point, английский
- The point at which a lens or mirror will focus parallel incident radiation.
- That distance from the focusing lens where the laser beam has the smallest diameter.
- When parallel rays of light are refracted by a lens they will converge or diverge from the focal point of the lens.
- A property of the lens; the image point when light entering the lens is parallel (i.e., the object is an infinite distance from the lens)
- Point at which the instrument optics image the radiation detector at the target plane. in a radiation thermometer, this is where the spot size is the smallest. in a scanner or imager, this is where the instantaneous field of view is smallest.
- Point at which the instrument optics image the infrared detector at the target plane. in a radiation thermometer, this is where the spot size is the smallest. in a scanner or imager, this is where the instantaneous field of view (ifov) is smallest.3
Focal sphere, английский
Focal spot, английский
Focal spot (rt), английский
The area on the target that receives the bombardment of electrons and emits the primary radiation necessary to produce an image of the object on a radiographic film. the spot at which the sound beam from a focused search unit converges to maximum intensity.
Focal spot of the zero diffracted order, английский
Focal spot size, английский
Focal transmission (of infection), английский
Циркуляция (передача) возбудителя инфекции в пределах эпидемического очага
Focal zone, английский
- Distance before and after the focal point in which the intensity differs a specified amount (usually 6 db) from the focal intensity. also called depth of field or depth of focus.1
- Distance before and after the focal point in which the intensity differs a specified amount (usually 6 db) from the focal intensity.7 also called depth of field or depth of focus.
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Enfocar, испанский
Distancia focal, испанский
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