To close, as an aperture, by filling or by obstructing; as, to stop the ears; hence, to stanch, as a wound.
To obstruct; to render impassable; as, to stop a way, road, or passage.
The act of stopping, or the state of being stopped; hindrance of progress or of action; cessation; repression; interruption; check; obstruction.
That which stops, impedes, or obstructs; as obstacle; an impediment; an obstruction.
The closing of an aperture in the air passage, or pressure of the finger upon the string, of an instrument of music, so as to modify the tone; hence, any contrivance by which the sounds of a musical instrument are regulated.
The diaphragm used in optical instruments to cut off the marginal portions of a beam of light passing through lenses.
Some part of the articulating organs, as the lips, or the tongue and palate, closed (a) so as to cut off the passage of breath or voice through the mouth and the nose (distinguished as a lip-stop, or a front-stop, etc., as in p, t, d, etc.), or (b) so as to obstruct, but not entirely cut off, the passage, as in l, n, etc.; also, any of the consonants so formed.
A relative measure of light that can be used to describe an aperture or shutter speed, although it is more commonly used with aperture settings. A difference of one stop indicates half or double the amount of light. To stop down means to narrow the aperture; to open up means to expand it.
An aperture setting, or shutter speed setting, on a lens or camera. Also, a change in exposure by a factor of two.
a unit of relative exposure used in photography. In optics, a "stop" is a ring-shaped baffle or shield used to reduce the aperture (the diameter of the opening) of a lens. In photography, the amount of light used to expose the film can be controlled either by varying the aperture, by varying the length of time the shutter is open to admit light, or by some combination of these two methods. Two exposures differ by one stop if one is made with twice the light of the other; similarly, they differ by stops if one is made with 2 times the light of the other.
a mechanical device in a camera that controls size of aperture of the lens; "the new cameras adjust the diaphragm automatically"
an obstruction in a pipe or tube; "we had to call a plumber to clear out the blockage in the drainpipe"
a consonant sound produced by obstructing airflow in the vocal tract by the lips or tongue
A processing solution of acetic acid which stops development of film and papers instantly, and prevents contamination of other processing chemistry. Also means a doubling or halving of exposure by changing aperture, shutter speed or film speed rating by one setting while photographing, or by changing the aperture of the enlarger by one setting while making a print. Go to top
The relationship between the focal length of a lens and the effective diameter of its aperture. An adjustable iris diaphragm permits any ordinary photographic lens to be used at any stop within its range. Sometimes used synonymously with -number as in "-stop". A unit of exposure change.
As a noun stop is a single aperture setting or shutter speed setting. A "one stop" change in exposure is achieved by changing either the aperture or the shutter speed to the next incremental setting - i.e. doubling or halving the shutter speed or aperture value. (A shutter speed of 1/125 sec is a one stop change from 1/250 sec. An aperture of f/5.6 is a one stop change from f/8.) As a verb, to "stop down" is to decrease exposure by reducing the size of the aperture or increasing shutter speed - e.g. a light meter reading may indicate that you should stop down by three stops for proper exposure.
1. An aperture setting that indicates the size of the lens opening. 2. A change in exposure by a factor of two. Changing the aperture from one setting to the next doubles or halves the amount of light reaching the image sensor. Changing the shutter speed from one setting to the next does the same thing. Either changes the exposure one stop.
any of the range of f-numbered aperture settings.
See ƒ-number, but also refers to shutter speeds.