powers of the square root of 2: f/1, f/1.4, f/2, f/2.8, f/4, f/5.6, f/8, f/11, f/16, f/22, f/32, f/45, f/64, f/90, f/128, etc. Each element in the sequence...

The f-number is the ratio of the lens's focal length to the diameter of the entrance pupil. F-number or F number also may refer to: F number (chemistry)...

by the f-number, written f/N, where N is the f-number given by the ratio of the focal length f to the diameter of the entrance pupil D: N = f D . {\displaystyle...

F number is a correlation number used in the analysis of polycyclic aromatic hydrocarbons (PAHs) as a descriptor of their hydrophobicity and molecular...

A large number of variants of the General Dynamics F-16 Fighting Falcon have been produced by General Dynamics, Lockheed Martin, and various licensed manufacturers...

c f 2 {\displaystyle {\text{DOF}}\approx {\frac {2u^{2}Nc}{f^{2}}}} for a given maximum acceptable circle of confusion c, focal length f, f-number N,...

shutter and film winding mechanisms. As a result of the enormous increase in f-number, while maintaining the same exposure time, one must use a fast film in...

analysis of binary classification and information retrieval systems, the F-score or F-measure is a measure of predictive performance. It is calculated from...

f-number. Accordingly, as illustrated at right, a guide number can be factored to a small f‑number times a long distance just as readily as a large f‑number...

field. It is equivalent to adjusting the f-number inversely in proportion to crop factor – a smaller f-number for smaller sensors (this also means that...

A number is a mathematical object used to count, measure, and label. The most basic examples are the natural numbers 1, 2, 3, 4, and so forth. Numbers...

direct enharmonic, G-flat major, contains the same number of flats in its key signature. Tonic – F-sharp major Supertonic – G-sharp minor Mediant – A-sharp...

surface ocean f-number, f-ratio, or focal ratio, the ratio of the focal length of an optical system to the diameter of its entrance pupil F-number (disambiguation)...

(using round numbers) f/2 – f/4, f/4 – f/8, and f/8 – f/16 or (for a slower lens) f/2.8 – f/5.6, f/5.6 – f/11, and f/11 – f/22. These are not sharp divisions...

The Boeing F-15EX Eagle II is an American all-weather multirole strike fighter derived from the McDonnell Douglas F-15E Strike Eagle. The aircraft resulted...

heavier-duty F-250 through F-450 pickups, F-450/F-550 chassis cabs, and F-600/F-650/F-750 Class 6–8 commercial trucks. The F-Series was first introduced in 1948...

"Axel F" is an electronic instrumental track by German musician Harold Faltermeyer. It served as the theme for the 1984 film Beverly Hills Cop, starring...

and replace them with newly built F-15EX Eagle II in order to retain adequate number of air superiority fighters. The F-15E Strike Eagle is expected to...

etc. F with diacritics: Ƒ ƒ Ḟ ḟ ᵮ ᶂ Ꞙ ꞙ : F with stroke is used in the Anthropos phonetic transcription system and older Ewe writing ꬵ : Lenis F is used...

changed as long as the f-number is altered to compensate, e.g. 1/250 second at f/11 gives equivalent exposure to 1/125 second at f/16. More in general,...

number of the curve. The general form of Cauchy's integral formula establishes the relationship between the values of a complex analytic function f(z)...

photography, exposure value (EV) is a number that represents a combination of a camera's shutter speed and f-number, such that all combinations that yield...

= number whose sum of even digits and sum of odd digits are even 1044 = sum of distinct powers of 4 1045 = octagonal number 1046 = coefficient of f(q)...

F m F n + F m − 1 F n − 1 = F m + n − 1 , F m F n + 1 + F m − 1 F n = F m + n . {\displaystyle {\begin{aligned}{F_{m}}{F_{n}}+{F_{m-1}}{F_{n-1}}&=F_{m+n-1}...

airframe. On 29 September 1954, it performed its maiden flight. The F-101A set a number of world speed records for jet-powered aircraft, including fastest...

diameter, or minimum f-number, of a photographic lens. A lens with a larger than average maximum aperture (that is, a smaller minimum f-number) is called a "fast...

The Lockheed Martin F-35 Lightning II is an American family of single-seat, single-engine, stealth multirole combat aircraft designed for air superiority...

we find x = 1.22 λ f d , {\displaystyle x=1.22\,{\frac {\lambda \,f}{d}},} but f d {\displaystyle {\frac {f}{d}}} is the f-number of a lens. A typical...

24 mm f/2.0 24 mm f/2.8 28 mm f/2.0 28 mm f/2.8 28 mm f/3.5 35 mm f/1.4 35 mm f/2.0 35 mm f/2.8 45 mm f/2.8 GN 45 mm f/2.8 P 50 mm f/1.2 50 mm f/1.4 50 mm...

exit from the heavy-truck segment. The medium-duty F-Series has been used for an extensive number of applications, offered as a straight (rigid) truck...