Editing Filter (section)

=== Optics ===
* [[Optical filter]], selectively transmits light of different wavelengths
** [[Interference filter]], reflects one or more spectral bands or lines and transmits others, while maintaining a nearly zero coefficient of absorption for all wavelengths of interest
** [[Dichroic filter]], a very accurate color filter used to selectively pass light of a small range of colors while reflecting other colors
** [[Hydrogen-alpha filter]], an optical filter that transmits a narrow bandwidth of light centred on the H-alpha wavelength
** [[Photographic filter]], a camera accessory consisting of an optical filter that can be inserted in the optical path
** [[Infrared cut-off filter]], designed to reflect or block mid-infrared wavelengths while passing visible light
** [[Chelsea filter]], a dichromatic optical filter used for identifying coloured stones
** [[Astronomical filter]], a telescope accessory used to enhance the details of celestial objects