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F-число
| Глоссарий по видеонаблюдению (CCTV) |
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F-number, английский
- Указывает яркость изображения формируется объективом, контролируемые по радужной оболочке глаза. чем меньше f-число, тем ярче изображение.
- Indicates the brightness of the image formed by the lens, controlled by the iris. the smaller the f-number the brighter the image.
- In lenses with adjustable irises, the maximum iris opening is expressed as a ratio
- The standard measure of the lens aperture, which is the iris diameter, divided by the focal length of the lens. the lower the maximum aperture (f-number or f-stop), the more light that passes through the lens.
- In lenses with adjustable irises, the maximum iris opening is expressed as a ratio (focal length of the lens)/(maximum diameter of aperture). this maximum iris will be engraved on the front ring of the lens.
- The focal length of lens divided by its usable diameter. in the case of a laser, the usable diameter is the diameter of the laser beam or a smaller aperture which restricts a laser beam.
- In photography, the diameter of the aperture expressed in terms of the focal length of the camera lens. the greater the f-number, the less light reaches the film and the more in focus the objects in the foreground and the background will be. for example, with an f-number = 16 the objects in the far background will be in focus. whereas, with an fnumber = 2 the background will be blurry (while foreground objects are in focus). foad
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Слежение, русский
- Способ задания положения некоторой точки относительно других точек чертежа.
- Способ определения положения некоторой точки относительно других точек чертежа
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