the common term for the aperture setting of a lens.
aperture (opening or diaphragm setting) which allows a specific amount of light to pass through the lens of a film or video camera. The light metering system and type of lens, filtering, and speed of film determines the correct f-stop setting.
Indicates the speed of a lens. The smaller the number, the greater the amount of light that passes through the lens, thus allowing for better low light camera performance.
Refers to the aperture setting on a lens, which is used to control the amount of light that enters it.
indicates the shutter opening in a camera's lens which gauges the amount of light entering the camera and striking the film
The light gathering ability of a lens (known as a camera lens aperture setting) is indicated by an f-stop. Using a smaller f-stop number results in a greater amount of light passing through the lens, as well as a shallower depth of field.
The Æ’ number is the ratio between the size of the aperture and the focal length of the lens. Each f-stop means that the same measurement of light is reaching the camera. Each change in f-stop indicates either a doubling or halving of the amount of light. The ability of a lens to gather light depends on the relationship between the lens opening (aperture) and the focal length. Usually the F-stop can be found printed on the side or front of the lens. The lower the F-stop number, the larger the maximum lens aperture and the greater the lens ability to pass light through the camera.
The ratio between the focal length of a lens and the diameter of the iris opening. It is used to describe the light gathering ability of a lens
A measure of the size of the opening in a lens calibratedto a corresponding focal lenth. Thse numbers are typically stated as f/1.4, 2, 2.8, 5.6, 11, 16, 32, etc. Large f-stops (e.g., f/2.8) allow a lot of light to enter the camera. Smaller f-stops (e.g., f/22) allow less light to enter the camera.
a number representing the aperture setting of the camera
a number that refers to this hole
a unit of measurement assigned to light gain or loss
Lens calibration measuring an iris opening. Larger numbers equal smaller openings.
is a measure of the aperture opening. An f-stop of f/8 admits twice the amount of light as an f-stop of f/11. The f-stop numbering system is initially confusing because the smaller the number, the larger the aperture. f-stops are sequenced in this manner: f/1.4, f/2, f/2.8, f/4, f/5.6, f/8, f/11, f/16, f/22, etc. Increasing the f-stop by one stop (say from f /8 to f/11) halves the light reaching the film; decreasing the aperture by one f-stop (say from f/16 to f/11) doubles the amount of light.
Aperture size measured as a ratio of the focal length of the lens to aperture's diameter. Low f number means larger opening of camera lens.
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)
Controls the size of the hole in the camera that light passes through.
A number on a lens that denotes the size of the aperture. The number is obtained by dividing the focal length of the lens with the diameter of the aperture. The smaller the number, the wider the aperture. See Depth of field.
A measure of the size of a camera’s aperture. The higher the f-stop, the smaller the aperture.
A number that indicates the size of the lens aperture (opening). The common f-numbers on 35mm cameras are f1.4, f2, f2.8, f4, f5.6, f8, f11, f16, and f22. The larger the f-number, the smaller the lens opening, f22 is the smallest in this series. Also called the aperture, they work in conjunction with shutter speeds to indicate exposure settings. The number sequence is printed on the lens barrel, each higher f number halves the exposure of the preceding one. The f-number itself is effectively the number of times the aperture diameter will divide into the lens focal length. For example, f4 aperture diameter is one quarter the focal length (i.e. 25mm aperture diameter in a 100mm focal length lens).
A term indicating the speed of the lens. The smaller the f-number, the greater the amount of light allowed to pass through the lens.
The aperture size of a camera lens. The higher the number, the smaller the lens opening.
Indicates the speed of a lens. A smaller f-stop number indicates a greater amount of light that passes through the lens, thus allowing for better low-light camera performance.
A numerical designation that indicates the size of the aperture. It is inversely proportional as a smaller number like F2.8 is a large opening and a large number like F16 is a relatively small opening.
A scale that measures the size of the opening of an iris. The traditional scale runs: 1.4, 2, 2.8, 5.6, 8, 11, 16, 22. The smaller the number, the larger the opening of the iris, allowing more light. Conversely - the larger the number, the smaller the iris, allowing less light.
An f-stop is a designation to indicate a cameraâ€(tm)s aperture opening, and a flash unitâ€(tm)s power level. Our flash units are measured in power over a range of available f-stops, indicating the high or low power level setting of the unit. Each f-stop (shown on the back panel of our flash units) lets in twice as much light as the f-stop before it, and half as much light as the f-stop after it. Over a 5 f-stop range, the power is adjustable from Full down to 1/32 of the total power. For f-stops in relation to your cameraâ€(tm)s lens opening, see aperture.
A measurement used as a benchmark to correctly expose film, rate a lens as to how “fast” it is and is controlled by an iris in the lens to make the opening larger or smaller.
A number indicating the setting of the iris on the aperture of a camera lens. Larger numbers indicate smaller openings and vice versa.
Think of a Venetian blind, like the ones you see in homes and stores. The aperture or f-stop does the same thing in the camera that the blinds do in your home, it controls how bright, or intense, the light will be when reaching the film. Just as a set of blinds admit more light when open one forth inch than when open one sixteenth inch, so does your camera admit more light at f4 than f16.
the number that relates to a particular size opening in the lens that light passes through to reach the film plane (often expressed as a fraction or ratio 1:1.8)
The number assigned to a particular lens aperture (or opening) size.
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.
A term used to describe the speed of a lens, or its ability to pass light through its lensing and onto the imager. It is determined by dividing the focal length of the lens by the diameter.
A term used to indicate the speed of a lens. The smaller the f-number, the greater is the amount of light passing through the lens.
Numbers corresponding to variable size of camera's iris opening, and thus amount of light passing through lens. The higher the number, the less light enters. [See iris.
A means of measuring the width of the diaphragm opening, which determines how much light passes through the lens. Smaller numbers in an f-stop correspond to wider lens openings; as the f-stop reading increases in number, the lens opening decreases inversely.
A numerical designation that indicates the size of the aperture. Smaller numbers like f2.8 denote a large opening while a large number such as f16 denotes a small lens opening.
A term used to measure the size of a lens aperture.
A number that indicates the size of the lens opening. Some common f-stops on 35mm cameras are f2, f2.8, f4, f5.6, f8, f11, f16. The larger the f-stop, the smaller the lens opening, f16 is the smallest in the above series. Smaller openings (like f16) have greater depth of field.
Also called a lens F Number or the speed of a lens. An f-stop is a designation to indicate a cameraâ€(tm)s aperture opening. Each f-stop lets in twice as much light as the f-stop before it, and half as much light as the f-stop after it. Over a 5 f-stop range, the power is adjustable from full down to 1/32 of the total power. The f-stop is the numerical indication of how large a lens opening (aperture) is. The larger the f-stop number, the smaller the opening; for example, f/16 represents a smaller aperture than f/2. Some common f-stops on 35mm cameras are f2, f2.8, f4, f5.6, f8, f11, f16. Smaller openings (like f16) have greater depth of field.
A numerical designation (f/2, f 2.8, etc.) indicating the size of the aperture (lens opening).
is the ratio between the focal length of the lens and the effective diameter of the iris opening. It indicates the light gathering ability of the lens.
The f-stop is the unit of measure for the aperture. The f-stop is the the size of the aperture expressed as a fraction of the focal length of the lens. This is why some zoom lenses have different minimum f-stops based on the amount zoom. An f-stop of f/16 (f being the focal length), means that a 200mm lens has an aperture openning of 200/16 = 12.5mm. A 18mm lens has an aperture openning of 18/16 = 1.125mm. For a given f-stop any lens, regardless of focal length, transits the same amount of light to the sensor or film.