Filters

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Nov 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000eaa..booke4404b&link_type=abstract

"Encyclopedia of Astronomy and Astrophysics, Edited by Paul Murdin, article 4404. Bristol: Institute of Physics Publishing, 2001

Astronomy and Astrophysics

Astrophysics

Instrumentation And Observational Techniques, Astronomical Instrumentation

Scientific paper

Filters are used in astronomy for two main purposes, to either lower the overall intensity of the light or to restrict the wavelength range of the light that is being measured. When the eye was the only astronomical detector, filters were scarcely used, but astronomy has always adopted the new technologies of the day, be it photography, photomultiplier tubes, image tubes, CCDs or IR arrays. As th...

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