Photography. A device placed over the lens of a camera to absorb light of certain wavelengths or polarities.

a filter that modifies the intensity, spectrum, or polarization of the light passing through it; cf. colour filter n. at colour, n.1 compounds 4.

(a) a plate of coloured material used as a colour filter, esp. in older methods of colour photography (now historical); (b) a screen (esp. on an…

a filter that removes certain wavelengths or colours of the light passing through it.

Photography. Designating or relating to a method of colour photography in which a screen, containing a pattern of small filters of each of the…

In scientific and technical use. Photography. A screen containing a pattern of small filters of each of the primary colours, formerly used in the…

a lens filter, usually having a yellow upper half, used to improve the rendering of a bright sky; (also) = skylight filter n. at skylight, n.…

A photographic or optical filter that polarizes light passing through it, used chiefly for reducing reflections and improving contrast.

a piece of transparent material through which only light polarized in a particular plane can pass; spec. = polarizer, n. 2.

a lens filter, usually having a slight magenta tint, used to provide colour correction or to protect the surface of a lens; cf. sky filter n. at sky…