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Variable ND
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Variable ND

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Variable ND filter: rotatable neutral density filter using crossed polarizers, continuously adjustable ND 0.3–3.0 (1–10 stops). Enables rapid exposure adjustment without filter changes.

Technical Details

Variable ND filters typically achieve density values from ND 0.3 to ND 3.0 (equivalent to 1-10 stops). High-quality models like the Tiffen Variable ND or PolarPro Peter McKinnon Edition use multi-coated lenses with 16-20 coatings. At maximum darkening, characteristic cross-shadows (X-pattern) appear due to the crossed polarization axes. The filters are available in diameters from 52mm to 82mm; professional matte box systems use 4x4" or 4x5.65" variants.

History & Development

Singh-Ray developed the first commercial variable ND filter for photography in 1999. Tiffen adapted the concept for film productions in 2008 with the Variable ND. The breakthrough came in 2012 with RED cameras, whose high light sensitivity made variable NDs indispensable for daylight shooting. Modern versions like the B+W XS-Pro (2018) reduce color casts and vignetting through precise polarization film adjustment.

Practical Use in Film

Variable NDs allow for quick exposure adjustments in handheld shots without changing filters. "Mad Max: Fury Road" (2015) used them for continuous drives between shadow and sunlight. For interviews, they allow spontaneous aperture changes without interruption. Documentarians appreciate the flexibility in changing light conditions. Their use becomes problematic with wide-angle lenses below 35mm, where vignetting and X-pattern artifacts become visible.

Comparison & Alternatives

Fixed ND filters (ND 0.6, 1.2, 1.8) offer higher optical quality without polarization effects but require filter changes. Electronic ND filters in cameras like the Sony FX9 (ND 0.6-2.4) work without artifacts but are limited to camera-internal ranges. IRND filters combine infrared protection with neutral density, while variable NDs primarily operate in the visible spectrum. For controlled studio conditions, fixed filters remain standard; variable versions dominate documentary and run-and-gun productions.

From the crafts

Perspectives

Cinematographer

Ich nutze variable NDs hauptsächlich bei Handheld-Arbeiten und Dokumentationen, wo ich schnell auf wechselnde Lichtverhältnisse reagieren muss. Bei Weitwinkelbrennweiten unter 28mm vermeide ich sie wegen der X-Pattern-Artefakte, hier greife ich lieber zu gestapelten Festwert-Filtern. Die Zeitersparnis beim Dreh wiegt die minimalen optischen Kompromisse meist auf.

Director

Variable NDs geben mir die Freiheit, spontane Lichtstimmungen zu nutzen, ohne den Drehfluss zu unterbrechen. Bei emotionalen Szenen kann ich fließend zwischen verschiedenen Belichtungen wechseln und so die Atmosphäre organisch entwickeln lassen. Besonders bei Naturlicht-Drehs entstehen dadurch authentischere Momente, da die Schauspieler nicht durch technische Pausen aus der Rolle fallen.

Producer

Variable NDs reduzieren meine Filterkosten um etwa 60% gegenüber kompletten Festwert-Sets und verkürzen Setup-Zeiten um durchschnittlich 15 Minuten pro Szene. Ein hochwertiger variabler ND kostet 400-800 Euro, ersetzt aber ND-Sets für 1.500-2.000 Euro. Bei 20 Drehtagen sparen wir so etwa 5 Stunden Arbeitszeit, was bei einer 50-köpfigen Crew erhebliche Personalkosten reduziert.

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