### What does **f-number** mean?

## Definitions for **f-number**ˈɛfˌnʌm bər

#### Here are all the possible meanings and translations of the word **f-number**.

### Wiktionary

f-number(Noun)

The ratio of the focal length of a lens to its diameter; a measure of the light-gathering ability of the lens.

### Freebase

F-number

In optics, the f-number of an optical system is the ratio of the lens's focal length to the diameter of the entrance pupil. It is a dimensionless number that is a quantitative measure of lens speed, and an important concept in photography.

### Numerology

Chaldean Numerology

The numerical value of f-number in Chaldean Numerology is:

**5**Pythagorean Numerology

The numerical value of f-number in Pythagorean Numerology is:

**7**

### Sample Sentences & Example Usage

There's a number that's enough and there's a number that's not enough, the $20 million number is enough.

Politics is about the control of a limited number of resources by a limited number of people who think that number is too many

Number one: we want Lidl to get stronger in existing markets. Number two: we will expand to new countries. Number three: we will fundamentally overhaul Kaufland.

I am not judged by the number of times I fail, but by the number of times I succeed and the number of times I succeed is in direct proportion to the number of times I can fail and keep on trying.

I am not judged by the number of times I fail, but by the number of times I succeed; and the number of times I succeed is in direct proportion to the number of times I can fail and keep on trying.

### Images & Illustrations of f-number

# Translation

#### Find a translation for the **f-number** definition in other languages:

Select another language:

#### Discuss these f-number definitions with the community:

# Word of the Day

#### Would you like us to send you a **FREE** new word definition delivered to your inbox daily?

# Citation

## Use the citation below to add this definition to your bibliography:

"f-number." *Definitions.net.* STANDS4 LLC, 2017. Web. 24 Sep. 2017. <http://www.definitions.net/definition/f-number>.