Graduated neutral density filter

An optical filter that has a variable light transmission. Typically, one half of the filter is shaded transitioning either abruptly or gradually into the other (clear) half.
A graduated neutral density filter is used to bring an overly-bright part of a scene into the dynamic range of film or sensor.

Graduated neutral density filters are also called:

  • Split neutral density filter
  • Graduated ND filter
  • Graduated filter
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