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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
Kaynak: F-number

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

In that case, the relative focal-plane illuminance , however, would depend only on the f-number N, so it is less in the camera with the
Kaynak: Aperture

Lens speed refers to the maximum aperture diameter, or minimum f-number , of a photographic lens . smaller minimum f-number) is called a "
Kaynak: Lens speed

The effective aperture is expressed by an f-number or f-stop (derived from focal ratio), which is proportional to the ratio of the focal
Kaynak: Photography

Numerical aperture versus f-number : Image:Numerical aperture for a lens. svg | Numerical aperture of a thin lens . Numerical aperture is not
Kaynak: Numerical aperture

Four variables are available to the photographer to obtain the desired effect: lighting , film speed, f-number (aperture size), and
Kaynak: Film speed

Calculating the f-number & required exposure: File:PinholeCameraCloseup. jpg | A pinhole camera made from an oatmeal box. The pinhole is in
Kaynak: Pinhole camera

The f-number ("relative aperture"), N, is defined by N f/E N, where f is the focal length and E N is the diameter of the entrance pupil
Kaynak: Entrance pupil

See the articles on aperture and f-number for the photographic effect and system of quantification of varying the opening in the
Kaynak: Diaphragm (optics)

determine which shutter speed and f-number should be selected for an optimum exposure, given a certain lighting situation and film speed .
Kaynak: Light meter

controlled by the lens aperture diameter, which is usually specified as the f-number , the ratio of lens focal length to aperture diameter.
Kaynak: Depth of field

Shutter speed along with the aperture of the lens (also called f-number ) determines the amount of light that reaches the film or sensor.
Kaynak: Shutter speed

See also : f-number or focal ratio. Dioptre Focus (optics) References: Focal length. Category:Geometrical optics Category:Length Category:Science
Kaynak: Focal length

Formal definition : N is the relative aperture (f-number ) t is the exposure time (“shutter speed ”) in seconds- EV 0 corresponds to an
Kaynak: Exposure value

reciprocity (photography)aperture | exposure range | f-number An important principle of exposure is reciprocity . If one exposes the film
Kaynak: Exposure (photography)

where λ is the wavelength of the light and N is the f-number (focal length divided by diameter) of the imaging optics. In object space,
Kaynak: Diffraction

A camera's aperture is measured by a unitless number called the f-number or f-stop, , often notated as N, and given by: f/# N frac fD
Kaynak: Optics

Using a smaller CoC requires increasing the lens f-number to achieve the same DOF, and if the lens is stopped down sufficiently far, the
Kaynak: Circle of confusion

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