For F-STOP we have terms and definitions in 4 topics. The topics are CCTV, Camcorder, Film and Photography.

F-STOP (CCTV)

A term used to indicate the speed of a lens. The smaller the F-number the greater amount of light passes through the lens.

F-STOP (Camcorder)

Lens calibration measurement indicative of the iris opening, or aperture, measured in numbers of inverse proportion to aperture opening (i.e. large F-stop number equals small aperture opening)

F-STOP (Film)

The scale used to measure the size of the opening of the iris (the opening that lets light in) on a lens. F-stops can be confusing, because the larger the number, the smaller the opening (iris), less light is let in, on the other hand the smaller the number, the larger the opening, more light is let in. Common f-stops are 1.4, 2, 2.8, 4, 5.6, 8, 11, 16, and 22.

F-STOP (Photography)

A number that indicates the relative size of the opening of the lens (aperture) and written, for example, as f/16. Because the number is obtained by dividing the focal length of a lens by it's effective aperture, the larger the aperture, the smaller the f-number. In the conventional series, each number represents an aperture that admits half as much light as the preceding one. Thus f/16 lets half as much light as a lens opened to f/11.

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