What does f number mean?
Definitions for f number
f number
This dictionary definitions page includes all the possible meanings, example usage and translations of the word f number.
Princeton's WordNet
focal ratio, f number, stop number, speednoun
the ratio of the focal length to the diameter of a (camera) lens system
Wikipedia
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).
ChatGPT
f number
In photography, the f-number (also often referred to as the focal ratio, f-ratio, or f-stop) is a measure of the size of the lens aperture in relation to its effective focal length. It determines how much light the lens lets in and depth of field in a photograph. The f-number is calculated by dividing the focal length of the lens by the diameter of the aperture. Lower f-numbers correspond to larger apertures and allow more light to enter, while higher f-numbers correspond to smaller apertures and allow less light to enter.
Wikidata
F number
F number is a number used in the chemistry of polycyclic aromatic hydrocarbons as a descriptor of their molecular size. It was proposed by R.J. Hurtubise et al in 1977.
Matched Categories
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
Examples of f number in a Sentence
There are a limited number of exemptions for Department of Defense personnel who are relocating to the US who are moving their personal pets. It is not for them to bring back rescue dogs.
As we've said many times, and happy to reiterated right now, we have three highly efficacious vaccines with a very good safety profile, each preventing hospitalizations and deaths. That's point number one.
The nearest-term issuesThings may not have been blown up on Monday, but there are still very real issues that need to be resolved -- and quickly.There are intensive negotiations to find a compromise on prescription drugs -- something left out of Biden's framework -- that can make its way into the package. This is a huge issue for House Democrats, who know it polls extremely well and has also been a long-standing commitment for the party.But the opposition of a handful of House House Democrats and Sinema have limited the scope and scale of the initial ambitions.Still, for a few days it appeared it would be scrapped altogether. Then House Democrats launched frenzied behind-the-scenes negotiations to try and thread the needle. Those are still ongoing.Democratic leaders also have to address immigration, which a handful of House Democrats have also said must be addressed to secure House Democrats votes. Senate rules have limited -- if not outright killed -- most ambitions on this front. But leaders know they need some kind of resolution here.And finally, Manchin's full-throated view that Senator Manchin needs to see scores in order to vote on any final proposal isn't exclusive to him.There are a group of moderate House House Democrats who share that view and have communicated it with leadership, according to two sources.Given how quickly Democratic leaders want to move, that stance makes things more complicated.Remember : House Speaker Nancy Pelosi can only afford to lose three House Democrats. There is virtually no margin for error and a number of real issues to resolve -- and fast. Another under-appreciated outstanding issueProgressives may now be willing to move forward without explicit assurances from centrist senators, but moderate Democrats have been clear for weeks they don't want to vote on anything that will then be changed in the Senate. With Senator Manchin making clear there's still a long way to go with Senator Manchin, this is an issue that needs to be reconciled.About the Senator Manchin remarksCNN reported that Senator Manchin had been frustrated that House Democrats were trying to get Senator Manchin to make a clear endorsement of the $ 1.75 trillion framework -- and Senator Manchin wanted to make clear where Senator Manchin stood as Senator Manchin was getting lobbied to back adding more social programs to the plan, according to a source familiar with Senator Manchin thinking. Senator Manchin also had grown angry that progressives thought they had leverage over Senator Manchin to back the $ 1.75 trillion social safety net expansion plan if they withheld their support for the $ 1.2 trillion infrastructure bill, the source said. Senator Manchin, the source said, also didn't like last-minute changes being made to the social safety net proposal. In short, Senator Manchin didn't want to get jammed into supporting something Senator Manchin was far from ready to endorse.The White House viewAbout 20 minutes after Senator Manchin concluded Senator Manchin remarks, White House press secretary Jen Psaki released this statement :.
We are seeing a significant number of potential investment targets among small regional companies because of the difficulties in finding successors.
A fair number of people I talked to Saturday night were in this for the first time, it was not simply a rally of the usual suspects.
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"f number." Definitions.net. STANDS4 LLC, 2025. Web. 10 Feb. 2025. <https://www.definitions.net/definition/f+number>.
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