Look up: Aperture

1. aperture
   Small opening, for example the opening in the test of a foram.
   Found on http://www.ucmp.berkeley.edu/glossary/gl
   
   
2. Aperture
   The opening of a lens that controls the amount of light reaching the surface of the pickup device. The size of the aperture is controlled by the iris adjustment. By increasing the F-stop number (F/1.4, F/1.8, F/2.8, etc.) less light is permitted to pass to the pickup device.
   Found on http://www.zoo.co.uk/~z0001325/Glossary.
   
   
3. Aperture
   The opening in an optical system (scanner) that establishes the field of view
   Found on http://www.encyclo.co.uk/visitor-contrib
   
   
4. Aperture
   Working much like the pupil of the eye, the movement of the lens' internal aperture blades closes or opens the aperture to adjust the amount of light passing through the lens. The value inscribed on the aperture ring of the lens (F1.4, F2, F2.8, etc.) represents the size of the aperture and is calle...
   Found on http://www.panasonic.co.uk/html/en_GB/Te
   
   
5. Aperture
   The opening in a lens through which light passes to expose the film. Aperture size is usually calibrated in f-numbers, the larger the number, the smaller the lens opening, therefore the slower the shutter must be! (see f-stop)
   Found on http://www.peterashbyhayter.co.uk/glossa
   
   
6. aperture
   [n] - an opening in something 2. [n] - a device that controls amount of light admitted 3. [n] - an opening
   Found on http://www.webdictionary.co.uk/definitio
   
   
7. aperture
   A hole. The circular hole in the centre of a lens through which light passes to reach the film. The size of the hole can be varied using the aperture control which in turn alters a diaphragm within the body of the lens. Measured in f-stops. Altering by one F-stop either halves or doubles the amount of light reaching the film.
   Found on http://www.silverlight.co.uk/resources/g
   
   
8. Aperture
   (Digital cameras and photo printers) Mechanism behind the lens that controls the amount of light entering the camera. The aperture not only influences picture brightness but also regulates depth of focus. Most cameras are equipped with an iris aperture that can be freely adjusted or set according to pre-selected values.
   Found on http://www.olympus.co.uk/consumer/208_10
   
   
9. Aperture
   In a real camera, the size of the opening that light passes through (usually given in terms of its f-stop) in order to reach the film. The larger the f-stop, the smaller the opening. 3D software packages sometimes mimic the effects of different aperture settings on a recorded image during the rendering process.
   Found on http://www.computerarts.co.uk/downloads/
   
   
10. Aperture
    The opening on an optical system (scanner) that establishes the field of view
    Found on http://www.thebarcodewarehouse.co.uk/hel
    
    
11. Aperture
    An opening through which radiation can pass.
    Found on http://www.diracdelta.co.uk/science/sour
    
    
12. aperture
    A predetermined shape (round, square, oblong, etc.), size (width, diameter), and type (draw or flash) that is exposed on artwork film by a photoplotter.
    Found on http://www.ami.ac.uk/courses/topics/0100
    
    
13. Aperture
    An opening or orifice
    Found on http://www.dwp.gov.uk/medical/med_condit
    
    
14. aperture
    1)One or more adjacent characters in a mask that cause retention of the corresponding characters; 2)the mask consists of a pattern of two classes of characters of bits, one class (the apertures) causing selection of the corresponding parts of the operand, and the other class causing rejection of the...
    Found on http://www.mijnwoordenboek.nl/definition
    
    
15. Aperture
    Lens opening. The hole or opening formed by the metal leaf diaphragm inside the lens or the opening in a camera lens through which light passes to expose the film. The size of aperture is either fixed or adjustable. Aperture size is usually calibrated in f- numbers-the larger the number, the smaller...
    Found on http://www.rodsmith.org.uk/photographic%
    
    
16. Aperture
    Ap'er·ture noun [ Latin apertura , from aperire . See Aperient .] 1. The act of opening. [ Obsolete] 2. An opening; an open space; a gap, cleft, or chasm; a passage perforated; a hole; as, an aperture in a w...
    Found on http://www.encyclo.co.uk/webster/A/101
    
    
17. aperture
    <physics> The opening in an optical system which restricts the size of the bundle of rays incident on a given surface. (Usually circular and specified by diameter.) ... (09 Oct 1997) ...
    Found on http://www.mondofacto.com/facts/dictiona
    
    
18. aperture
    noun an man-made opening; usually small
    Found on http://wordnetweb.princeton.edu/perl/web
    
    
19. aperture
    noun a natural opening in something
    Found on http://wordnetweb.princeton.edu/perl/web
    
    
20. aperture
    (ap´әr-chәr) opening. numerical aperture an expression of the measure of efficiency of a microscope objective.
    Found on http://www.encyclo.co.uk/local/21001
    
    
21. Aperture
    • (n.) The diameter of the exposed part of the object glass of a telescope or other optical instrument; as, a telescope of four-inch aperture. • (n.) An opening; an open space; a gap, cleft, or chasm; a passage perforated; a hole; as, an aperture in a wall. • (n.) The act of opening.
    Found on http://thinkexist.com/dictionary/meaning
    
    
22. aperture
    (from the article `gastropod`) ...pattern around a central axis called the columella. Generally, the coils, or whorls, added later in life are larger than those added when the ...
    Found on http://www.britannica.com/eb/a-z/a/87
    
    
23. aperture
    in optics, the maximum diameter of a light beam that can pass through an optical system. The size of an aperture is limited by the size of the mount ... [4 related articles]
    Found on http://www.britannica.com/eb/a-z/a/87
    
    
24. Aperture
    A measure of the physical space available for beam to occupy in a device. Aperture limitations, however, are not always due to the physical size of the vacuum chamber; for instance, a magnetic field anomaly may deflect the beam so that the full available aperture cannot be used.
    Found on http://www-bdnew.fnal.gov/operations/acc
    
    
25. Aperture
    - The variable diameter opening in a camera lens that allows control of the intensity of light reaching the CCD. A camera's aperture and shutter speed determine a photo's exposure. Aperture diameters are expressed in f-numbers, e.g., f/11. As the f-number increases, the lens opening decreases. The l...
    Found on http://www.encyclo.co.uk/local/21026