fixed focal fixed-focus lens

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• Focal length — The focal length of an optical system is a measure of how strongly it converges (focuses) or diverges (diffuses) light. A system with a shorter focal length has greater optical power than one with a long focal length. Thin lens approximation For… …   Wikipedia

• Focus (optics) — An image that is partially in focus, but mostly out of focus in varying degrees. In geometrical optics, a focus, also called an image point, is the point where light rays originating from a point on the object converge.[1] Although the focus is… …   Wikipedia

• focus — [fō′kəs] n. pl. focuses or foci [fō′sī΄] [ModL, adopted in math. senses by KEPLER Johannes (1604) < L, fireplace, hearth < ? IE base * bhok , to flame, burn > ? Arm boc̣, flame] 1. the point where rays of light, heat, etc. or waves of… …   English World dictionary

• focus — ► NOUN (pl. focuses or foci) 1) the centre of interest or activity. 2) the state or quality of having or producing clear visual definition: his face is out of focus. 3) the point at which an object must be situated with respect to a lens or… …   English terms dictionary

• 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

• Lens (anatomy) — Crystalline lens (anatomy) Light from a single point of a distant object and light from a single point of a near object being brought to a focus by changing the curvature of the lens …   Wikipedia

• Focus free lens — A focus free lens is a photographic lens whose focal point is fixed at its hyperfocal distance. Rather than having a method of determining the correct focusing distance and setting the lens to that focal point, a focus free lens relies on depth… …   Wikipedia

• focus — focusable, adj. focuser, n. /foh keuhs/, n., pl. focuses, foci / suy, kuy/, v., focused, focusing or (esp. Brit.) focussed, focussing. n. 1. a central point, as of attraction, attention, or activity: The need to prevent a nuclear war became the… …   Universalium

• focus — fo•cus [[t]ˈfoʊ kəs[/t]] n. pl. cus•es, ci ( sī, kī) 1) a central point, as of attention or activity 2) phs a point at which rays of light, heat, or other radiation meet after being refracted or reflected 3) opt a) the focal point of a lens b)… …   From formal English to slang

• focus — I. noun (plural foci; also focuses) Etymology: New Latin, from Latin, hearth Date: 1644 1. a. a point at which rays (as of light, heat, or sound) converge or from which they diverge or appear to diverge; specifically the point where the… …   New Collegiate Dictionary

• focus — noun (plural focuses or foci fəʊsʌɪ) 1》 the centre of interest or activity.     ↘an act of focusing on something. 2》 the state or quality of having or producing clear visual definition.     ↘another term for focal point.     ↘the point at which… …   English new terms dictionary