f-stop


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f-stop

any of the settings for the f-number of a camera

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.
References in periodicals archive ?
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.
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.
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.
The lens is one of those fancy Carl Zeiss efforts, with a 10x optical zoom allowing 35-mm camera f-stop equivalents of F1.
With camera systems, the f-stop must be adjusted to provide the correct amount of light at a given distance and lighting condition.
If necessary, capture additional images of the impression by bracketing exposures up one f-stop and down one f-stop.
It also supports more advanced image adjustment tools, such as f-stop adjustments, image sharpening and noise filtering.
A smaller depth-of-field (smaller f-stop number) focuses the attention on your subject not the background.