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F-number, f-stop

Глоссарий терминов в фотографии
    F-number, f-stop. the numerical value of a lens aperture. the ratio of the focal length of the lens divided by its effective aperture diameter.




F-stop, английский
  1. Термин, используемый для обозначения скорости линзы. чем меньше f-число, тем большее количество света, проходящего через объектив.

  2. A term used to indicate the speed of a lens. the smaller the f-number the greater amount of light passes through the lens.

  3. See f-number fast address a system for setting the address of the camera remotely from the control system.

  4. A numerical designation that indicates the size of the aperture. it is inversely proportional as a smaller number like f2.8 is a large opening and a large number like f16 is a relatively small opening.

  5. Is a measure of the aperture opening in the lens defined by dividing the focal length of the lens by the aperture diameter. sequence of f-stops are multiples of the square root of 2 (1.414…): 1, 1.4, 2, 2.8, 4, 5.6, 8, 11, 16, 22, etc. even though these numbers are rather cryptic, just remember that each step is double the amount of light. know that and it’s half the battle.

  6. Number indicating the size of the aperture. it is an inversely proportionate number as in f2.8 is a large opening and f16 is a small opening.

  7. In photography, a unit on a scale used on camera lenses to indicate a sequence of f-numbers where each stop corresponds to an f-number and with each stop the light that reaches the film is halved. fth (n)


F-stop (aperture), английский
    A term used to describe the aperture, or diaphragm opening of a lens. f-stops are defined numerically: f/1.4, f/5.6, f/22, etc. larger, or wider apertures, allow more light to enter the lens, which calls for faster shutter speeds. “faster” (wider) apertures also allow for selective focus (narrow depth of field), while slower (smaller) apertures allow for greater depth of field. wider apertures are preferable for portraits, while smaller apertures are preferable for landscapes. for more on this subject, see the explora article, “understanding aperture.”


Full frame, английский
    Full frame, where the image sensor is approximately the same size as a 35 mm film negative: 36 ? 24 mm.


Exchangeable image file format, английский
  1. Exchangeable image file format. a standard format for tag data in digital camera files.

  2. A standard for storing metadata, e.g. shutter speed and focal length, in image files, especially files using jpeg compression.