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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.
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It can be considered the digital equivalent of a split neutral-density filter, which has been allowed for many years.
Interpretations of the PSA Nature definition by Hearst, Joseph / PSA Journal
The neutral-density filter rings are attached directly to the objective for easy exchange when brightness adjustment is necessary.
Microscopes: end-user ergonomics by Medical Laboratory Observer
This may take the form of a gray, neutral-density filter, a partially aluminized film, or a tinted/smoked glass or plastic material.
An inside look at covert surveillance by Kruegle, Herman / Security Management
 
 
 
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