- aperture of lens
- angle of a.
Medical dictionary. 2011.
aperture of lens
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Lens speed — refers to the maximum aperture diameter, or minimum f number, of a photographic lens. A lens with a larger maximum aperture (that is, a smaller minimum f number) is a fast lens because it delivers more light intensity (illuminance) to the focal… … Wikipedia
Aperture priority — Aperture priority, often abbreviated Av (for Aperture value) or A on a camera dial, is a setting on some cameras that allows the user to choose a specific aperture value while the camera selects a shutter speed to match. The camera will ensure… … Wikipedia
Lens flare — is the light scattered in lens systems through generally unwanted image formation mechanisms, such as internal reflection and scattering from material inhomogeneities in the lens. These mechanisms differ from the intended image formation… … Wikipedia
aperture — [ap′ər chər] n. [L apertura < apertus, pp. of aperire, to open < IE * ap wer , to uncover < base * ap(o) away + * wer to close, cover > WARN] 1. an opening; hole; gap 2. the opening, or the diameter of the opening, in a camera,… … English World dictionary
Aperture — For other uses, see Aperture (disambiguation). f stops demonstrated on a lens … Wikipedia
Lens (optics) — For other uses, see Lens. A lens. Lenses can be used to focus light. A lens is an optical device with perfect or approximate axial symmetry which tra … Wikipedia
Aperture card — An aperture card is a type of punched card with a cut out window into which a chip of microfilm is mounted. Such a card is used for archiving or for making multiple inexpensive copies of a document for ease of distribution. The card is typically… … Wikipedia
aperture — (f/number) Lens opening. The opening in a lens system through which light passes.The size of aperture is either fixed or adjustable. Lens openings are usually calibrated in f numbers … Forensic science glossary
aperture — [[t]æ̱pə(r)tʃə(r)[/t]] apertures 1) N COUNT An aperture is a narrow hole or gap. [FORMAL] Through the aperture he could see daylight. 2) N COUNT In photography, the aperture of a camera is the size of the hole through which light passes to reach… … English dictionary
Lens — The transparent structure inside the eye that focuses light rays onto the retina (the nerve layer that lines the back of the eye, senses light and creates impulses that go through the optic nerve to the brain). The lens was named after the lentil … Medical dictionary
