colour filter

British

noun

photog a thin layer of coloured gelatine, glass, etc, that transmits light of certain colours or wavelengths but considerably reduces the transmission of others

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colour filter

In 2012 they re-examined a small part of the centre of the HUDF, this time with an additional colour filter and a time exposure totalling about 23 days.

From Nature ● May 29, 2013

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