f-stop


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f-stop

any of the settings for the f-number of a camera
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

f-stop

(Focal-STOP) The f-stop is the "aperture" opening of a camera lens, which allows light to come in. It also determines how much is in focus in front of and behind the subject (see depth of field). The f-stop is one of the two primary measurements of a camera lens. The other is the "focal length," which establishes how much of the scene is in view (see focal length).

Length Divided by Opening
The f-stop is the focal length of the lens divided by the diameter of its opening. Each consecutive f-stop halves the opening of the previous. For example, an 80mm lens with its f-stop set to f8 means that the optics inside the lens create a diameter equivalent to 10mm. Changing the f-stop to f16 creates a diameter of 5mm. See focal length.
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References in periodicals archive ?
Do you need to load the right kind of film, check the F-stop, or even focus the thing?
Each change in f-stop corresponds to a doubling or halving in aperture size.
"Our new HDR camera technology and software enables us to capture and display dynamic HDR images, covering at least 20 f-stops, at full high-definition resolution, and at 30 frames-per-second.
The N86 is Nokia's new 8 megapixel camera phone and it will sport a wide-angle Carl Zeiss Tessar optics lens with a mechanical shutter up to 1/1000 and a f-stop range of 2.4-4.8 to suit low light conditions.
The lens is infrared (IR)corrected to keep FlexiDome day/night cameras in focus at all times, and has an f-stop of f/1.4 to allow a greater amount of light to pass through the lens to the image sensor--resulting in enhanced sensitivity and fast reaction to light-level changes.
They had already practiced the technique of reciprocity: making shutter speed, f-stop, light and film speed agree.
Your shutter speed stinks, F-stop is funky and your lens cap is on.
(1) For instance, while taking a picture, a person can use a narrow f-stop and a fast shutter speed to make a photograph taken during the day appear as if someone took it at night.
It delivers unprecedented image quality, 10 f-stop dynamic range, a 7-inch LCD touchscreen interface, gigabit connectivity, battery-powered operation, and up to 4 hours of continuous shooting on its USB2.0 hot-swap 160GB notebook hard drive.
They provide a high-resolution image and fast F-stop with infrared corrective feature for removing the focus shift between day and night modes.
The electronic lens control allows speeds to 1/500 second an 1/10 f-stop intervals, producing accurate and consistent shutter performance.