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O que (quem) é F-number - definição

RATIO OF THE FOCAL LENGTH TO THE DIAMETER OF THE ENTRANCE PUPIL

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f-number

¦ noun Photography the ratio of the focal length of a camera lens to the diameter of the aperture being used for a particular shot.

F-number

In optics, the f-number of an optical system such as a camera lens is the ratio of the system's focal length to the diameter of the entrance pupil ("clear aperture").Smith, Warren Modern Optical Engineering, 4th Ed.

https://en.wikipedia.org/wiki/F-number

f-stop

¦ noun Photography a camera setting corresponding to a particular f-number.

Wikipédia

F-number

In optics, the f-number of an optical system such as a camera lens is the ratio of the system's focal length to the diameter of the entrance pupil ("clear aperture"). It is also known as the focal ratio, f-ratio, or f-stop, and is very important in photography. It is a dimensionless number that is a quantitative measure of lens speed; increasing the f-number is referred to as stopping down. The f-number is commonly indicated using a lower-case hooked f with the format f/N, where N is the f-number.

The f-number is the reciprocal of the relative aperture (the aperture diameter divided by focal length).

https://en.wikipedia.org/wiki/F-number

Exemplos do corpo de texto para F-number

1. "This can potentially create a recipe for disaster, therefore in order to have a stress–free day it‘s essential to get the variants right." His formula equates the perfect Christmas (PX) to the number of family members (F), number (P) and cost () of Christmas presents given, number of walks taken (W), number of games played (G), the amount of wine and chocolate (W:C) consumed and the ratio of turkey to nut roast (T:R). He says that by dividing that by the total days (D) you spend with your family, you have the perfect Christmas.