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neutral density filter

Line breaks: neu|tral dens|ity fil¦ter

Definition of neutral density filter in English:

noun

A photographic or optical filter that absorbs light of all wavelengths to the same extent, causing overall dimming but no change in colour.
Example sentences
  • An action spectrum for light-induced death was carried out using excitation filters and neutral density filters to vary the excitation wavelength and keep peak illumination intensity constant.
  • Another use for this filter on sunny days is that it can be used as a neutral density filter in order to give you longer shutter speed times.
  • Simulations of senile miosis using a pupil-constricting drug and the age-related increase in lenticular light absorption using a neutral density filter in young observers could not account for the results.

Definition of neutral density filter in:

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