Movie Terms Wiki Filmmaking

ND Filter

A Neutral Density filter reduces the amount of light entering the camera lens without affecting color balance.


Purpose

ND filters enable cinematographers to shoot at wider apertures or slower shutter speeds in bright conditions, preserving desired depth of field and motion blur.

Types

  • Fixed ND — A single density level.
  • Variable ND — Adjustable density by rotating the filter.
  • Graduated ND — Darker at one end, used for balancing bright skies with darker landscapes.

Applications in Filmmaking

  • Shooting wide-open for shallow focus under midday sun.
  • Maintaining consistent exposure when moving between interior and exterior shots.
  • Controlling highlights in high-contrast scenes.

Technical Note

ND filters are measured in optical density or f-stop reduction, such as ND 0.3 (1 stop) or ND 1.2 (4 stops).

Evolution

From glass plates in early cinema to multi-coated, high-transmission filters today, ND filters remain essential in any cinematographer’s toolkit.


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