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)...

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

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...

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...

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...

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...

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,...

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...

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

(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...

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...

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

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...

events. 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...

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)...

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...

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...

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}...

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...

\over S_{2}}{f \over S_{1}-f}\,.} This can optionally be expressed in terms of the f-number N = f/A as: c = | S 2 − S 1 | S 2 f 2 N ( S 1 − f ) . {\displaystyle...

= 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)...

it kept the basic F-84 number. Production delays on the F-84F resulted in another order of the straight-wing version; this was the F-84G. In 1944, Republic...

saw a revision to the F-Series model nomenclature, shifting from a one-digit model number to a three-digit number; F-100 to F-350. This system has remained...

Firebird. The fourth character in the Vehicle Identification Number for an F-body car is "F" on model year 1985 and up vehicles. Earlier Camaros and Firebirds...

same focal length as a single 2.5-dioptre lens. Depth of field Dioptre f-number or focal ratio Wikimedia Commons has media related to Focal length. Grievenkamp...