neutral-density filter


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neutral-density filter

[′nü·trəl ¦den·səd·ē ′fil·tər]
(optics)
An optical filter that reduces the intensity of light without appreciably changing its color; used on a camera when the lens cannot be stopped down sufficiently for use with a given film. Also known as gray filter; neutral filter.
References in periodicals archive ?
The neutral-density filter rings are attached directly to the objective for easy exchange when brightness adjustment is necessary.
4] plate, a 10% neutral-density filter was placed in the beam incident on the sample for measurements made at -15/15.
Increase the lighting to reduce the sensitivity needed in the camera and add a fixed neutral-density filter.