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F number

F number logo #10101) Camera lens ratio 2) Photographic ratio 3) Stop in photography
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F-number

F-number logo #10101) Dimensionless number
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F-number

F-number logo #21000 In optics, the f-number (sometimes called focal ratio, f-ratio, f-stop, or relative aperture) 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. Ignoring differences in light transmis....
Found on http://en.wikipedia.org/wiki/F-number

F number

F number logo #21000[chemistry] F number is a number used in the chemistry of polycyclic aromatic hydrocarbons (PAHs) as a descriptor of their molecular size. It was proposed by R.J. Hurtubise et al in 1977. ==Calculation== From a PAH it can be calculated using the formula: F = B2 + C12 - R / 2, ==Example== For fluorene, the F number is: F = 6 + 1 - 0.5 = 6.5....
Found on http://en.wikipedia.org/wiki/F_number_(chemistry)

f-number

f-number logo #20973<radiobiology> In optics, denotes the ratio of the equivalent focal length of an objective lens to the diameter of its entrance pupil. ... (09 Oct 1997) ...
Found on http://www.encyclo.co.uk/local/20973

F-number

F-number logo #21048The number resulting when the focal length of a lens is divided by the diameter of the aperture. A sequence of f-numbers calibrates the aperture in regular steps (know as stops) between the minimum and maximum openings of the lens. The f-numbers generally follow a standard sequence, in such a way that the interval between one full stop ...
Found on http://www.encyclo.co.uk/local/21048

f-Number

f-Number logo #20948A number that indicates the size of the lens opening on an adjustable camera. The common f-numbers are f/1.4, f/2, f/2.8, f/4, f/5.6, f/8, f/11, f/16, and f/22. The larger the f-number, the smaller the lens opening. In this series, f/1.4 is the largest lens opening and f/22 is the smallest. Also called f-stops, they work in conjunction with shutter...
Found on http://www.rodsmith.org.uk/photographic%20glossary/rods%20photographic%20gl

F-number

F-number logo #20156In lenses with an adjustable iris, the maximum iris opening is expressed as a ratio (focal length of the lens)/(maximum effective diameter of aperture). This maximum iris will be marked on the front ring of the lens.
Found on http://www.zoo.co.uk/~z0001325/Glossary.html

f-number

f-number logo #21221Measure of the relative aperture of a telescope or camera lens; it indicates the light-gathering power of the lens. In photography, each successive f-number represents a halving of exposure speed
Found on https://www.encyclo.co.uk/local/21221

f-number

f-number logo #21199a number corresponding to the ratio of the focal length to the diameter of a lens system, esp. a camera lens. In f/1.4, 1.4 is the f-number and signifies that the focal length of the lens is 1.4 times as great as the diameter. Abbr.: f/, f/, f, f: Also calledCf. relative aperture.
Found on https://www.infoplease.com/dictionary/f-number
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