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ND 0.9
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ND 0.9

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Neutral Density filter with optical density 0.9, reducing light by three stops (ND8), ideal for moderate bright conditions and maintaining cinematic depth of field.

Optical Density and Aperture Value

The ND 0.9 filter (also known as ND8) has an optical density of 0.9 and reduces incoming light by three stops. This means the amount of light is reduced to one-eighth.

The ND8 designation system indicates: ND8 means light is divided by 8. This corresponds to a reduction of 3 stops (3 x halving = eighth).

Typical Applications

Moderate to Bright Lighting Conditions

The ND 0.9 is ideal for transitional lighting situations between ND 0.6 and ND 1.2. On bright, overcast days or in scenes with mixed lighting, this filter offers the right balance.

Combinability for Extended Reduction

The ND 0.9 can be combined with the ND 0.3 or ND 0.6. ND 0.3 + ND 0.9 = ND 1.2 (4 stops), ND 0.6 + ND 0.9 = ND 1.5 (5 stops). This makes the system very flexible.

Professional Exterior Shots

Many productions use a set of ND 0.3, ND 0.6, and ND 0.9 – this is more cost-effective and flexible than variable filters, with better optical quality.

Difference from Variable ND Filters

Variable ND filters can cover the ND 0.9 range but have:

  • Cross-polarization effects: Visible patterns at wide angles
  • Color shifts: Magenta or green at strong settings
  • Lower optical quality: Multiple internal layers
  • Greater weight and size: Variable filters are often thicker

The fixed ND 0.9 is lighter, more precise, and cheaper when combining multiple filters.

Relation to the 180-Degree Shutter Rule

Along with the ND 0.6, the ND 0.9 is part of a professional filter system. While the ND 0.6 is perfect at f/2.8, the ND 0.9 allows for the same shutter speed of 1/50 second (at 25p) at smaller apertures like f/4 or f/5.6.

The ND 0.9 reduction makes sense when:

  • The light is stronger than needed for ND 0.6
  • You want to work at f/4 instead of f/2.8
  • You need to stack multiple filters for flexible options

Specifications

  • Optical Density: 0.9
  • Light Loss: 3 stops
  • Multiplier: ND8
  • Typical Transmission Rate: 12.5%
  • Usage Range: Bright to very bright daylight
  • Combinations: Often stacked with ND 0.3 or ND 0.6

Practical Application Examples

  • Switching between lighting situations: Flexible without filter changes
  • Systems with fixed filters: Combinable instead of variable filters
  • Documentary: Quick transitions between interior and exterior shots
  • Music videos: Consistent visual language in changing weather
From the crafts

Perspectives

Cinematographer

Der ND 0,9 ist mein Standardfilter als Ergänzung zum ND 0,6. Mit drei Blenden Reduktion kann ich bei mittleren bis hellen Lichtverhältnissen konstant bei f/2,8 arbeiten und dabei die richtige Bewegungsunschärfe mit der 180-Grad-Shutter-Regel bewahren. Die Kombination aus ND 0,6 und ND 0,9 gibt mir ein flexibles System für fast alle Tageslicht-Situationen.

Director

Der ND 0,9 ermöglicht mir bei moderaten Lichtverhältnissen die vollständige visuelle Kontrolle über die Schärfentiefe. Ich kann konstant mit einer filmischen Offenblende arbeiten, was meiner Bildsprache Konsistenz gibt – ob in hellen oder bewölkten Momenten. Das ist entscheidend für die narrative Kontinuität.

Producer

Der ND 0,9 ist ein wirtschaftlicher Filter, der zusammen mit dem ND 0,6 ein flexibles und günstiges System bildet. Zwei oder drei ND-Filter kosten weniger als variable Filter mit denselben Fähigkeiten, bieten aber bessere optische Qualität.

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