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What (who) is mechanical filter - definition
Mechanical filter
TYPE OF SIGNAL PROCESSING FILTER
Microelectromechanical filter
A mechanical filter is a signal processing filter usually used in place of an electronic filter at radio frequencies. Its purpose is the same as that of a normal electronic filter: to pass a range of signal frequencies, but to block others.
Mechanical filter (respirator)
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.jpg?width=200 "Face mask FFP2 without exhalation valve")
.jpg?width=200 "Face mask KN95")
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![Filtering half mask, reusable [[elastomeric respirator]] with pink replaceable pancake filters and grey exhalation valve](https://commons.wikimedia.org/wiki/Special:FilePath/Police officer wearing half-mask respirator.jpg?width=200 "Filtering half mask, reusable [[elastomeric respirator]] with pink replaceable pancake filters and grey exhalation valve")
RESPIRATOR PARTICULATE FILTER
Filtering face piece; Filtering face pieces; KN95; KF94; Filtering facepiece respirator; KN-95; Mechanical filter respirator; Filtering-facepiece respirator; Filtering facepiece
Mechanical filters are a class of filter for air-purifying respirators that mechanically stops particulates from reaching the wearer's nose and mouth. They come in multiple physical forms.
Photographic filter
![The 80A filter, mainly used to correct for the excessive redness of [[tungsten]] lighting, can also be used to oversaturate scenes that already have blue. The photo on the left was shot with a polarizer, while the one on the right was shot with a polarizer and an 80A filter.](https://commons.wikimedia.org/wiki/Special:FilePath/80a comparison.jpg?width=200 "The 80A filter, mainly used to correct for the excessive redness of [[tungsten]] lighting, can also be used to oversaturate scenes that already have blue. The photo on the left was shot with a polarizer, while the one on the right was shot with a polarizer and an 80A filter.")
![The ''LOMO effect'' imitates photos made with a low-cost Russian camera brand, named "LOMO". It is approximated by saturated central colors, blurred periphery, and darkened corners and edges ([[vignetting]]).}} effect.](https://commons.wikimedia.org/wiki/Special:FilePath/Verblühende Sauerkirsche.jpg?width=200 "The ''LOMO effect'' imitates photos made with a low-cost Russian camera brand, named \"LOMO\". It is approximated by saturated central colors, blurred periphery, and darkened corners and edges ([[vignetting]]).}} effect.")
CAMERA ACCESSORY CONSISTING OF AN OPTICAL FILTER
Daylight filter; Filter (photography); Lens filter; Filter ring; Filter mount; Filter thread; Cross screen filter; Photographic filters; Red Black and White filter; Camera filter; Series filter
In photography and cinematography, a filter is a camera accessory consisting of an optical filter that can be inserted into the optical path. The filter can be of a square or oblong shape and mounted in a holder accessory, or, more commonly, a glass or plastic disk in a metal or plastic ring frame, which can be screwed into the front of or clipped onto the camera lens.
