The ratio of the focal length of a lens to its diameter; a measure of the light-gathering ability of the lens.
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.
The numerical value of f-number in Chaldean Numerology is: 5
The numerical value of f-number in Pythagorean Numerology is: 7
Examples of f-number in a Sentence
I played one of the best matches of the season. I prepared Novak Djokovic as world number very well for this match. I lost to Stefanos about three weeks ago in Shanghai, and obviously I went through the videos and( got) understanding on what I did well, what I didn't do so well, what I can do better.
As part of our delegation, Canada's trade minister is here. She will be meeting with Japanese companies and is expected to make a number of announcements as part of her visit.
We built Fleets as a lower-pressure, ephemeral way for people to share their fleeting thoughts, but... we haven't seen an increase in the number of new people joining the conversation with Fleets like we hoped.
This herd can be managed at a sustainable number.
Within the next five years, we will have the same amount of large-scale theme parks [ as Orlando ] and there will be eight parks in the UAE by 2019, the infrastructure here in Dubai is far superior to that of Orlando. Dubai has more hotel rooms than Orlando, a bigger food and beverage industry and Dubai’s airport has twice the number of passengers than Orlando’s.