Photography: The Definition of Filters
Filters are transparent or translucent optical elements that modify the quality of light passing through the lens to the image sensor or filmstrip during an exposure. The specific definition of filters varies depending on the type of filter.
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Ultraviolet
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Ultraviolet filters are transparent optical filters that absorb ultraviolet light frequencies and prevent ultra violet light from reaching image sensor of filmstrip. Digital photographers define ultra violet filters as lens protectors, because they do not change the visual quality of photographs.
Neutral Density
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Neutral Density filters are translucent optical filters that absorb light evenly throughout the visible spectrum and alter the exposure without changing the aperture or causing a color-cast.
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Polarizers
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Color filters are translucent optical filters that mimic the effect of particular light color temperatures by modifying the color frequency of the light passing through the lens.
Diffusers
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Diffusion filters are translucent optical filters that reduce a shots focus and modify the image-forming light in a shot by blending portions of the original light with physical elements of the filter. Some physical elements are stocking-like fabrics, mesh and net materials.
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References
Resources
- Photo Credit orange filter image by Stanisa Martinovic from Fotolia.com
