fixed-focus lens

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• Fixed focus — A fixed focus lens is a lens of which the focus is not adjustable. The focus is set at the time of manufacture, and remains fixed. The focus is generally set so the depth of field ranges from one metre to infinity, which is acceptable for most… …   Wikipedia

• fixed-focus — ˈ ̷ ̷| ̷ ̷ ̷ ̷ adjective : not provided with a focusing adjustment used of a camera having a lens of small aperture focused at about 8 to 15 feet …   Useful english dictionary

• 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 (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

• 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

• 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