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F-stop (aperture)

Lens Glossary
    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.”




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)


Numerically, английский

Understanding, английский
  1. Интерпретация

  2. N когн. понимание (син. comprehension) ungrammatical a неправильно построенное (предложение ) (син. ill formed)


Aps-c (apsc), английский
    A term used to describe the size of the digital imaging sensors used in almost all compact dslrs. the name is derived from the aps (advanced photo system) film format that was introduced in 1996 for the amateur point-and-shoot market. the aps format is about half the size (23.6 x 15.8mm) of a standard 35mm frame (24 x 36mm) and has a 1.5x magnification factor (multiply the focal length x 1.5) for determining the 35mm equivalent focal length of lenses used on aps-c format cameras. aps-c format dslrs from nikon, pentax, fujifilm, and sony (alpha) contain aps-c sized imaging sensors.


Non-lossy (aka lossless), английский
    A term that refers to data compression techniques that do not remove image data details, to achieve compression. this method is generally less effective than lossy methods in terms of reducing file size, since the entire original image is retained. see lossy.