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Neutral Density Filters
In black-and-white and color photography, filters such as
the KODAK WRATTEN Neutral Density Filters No. 96
reduce the intensity of light reaching the film without
a ffecting the tonal rendition in the original scene. In
m o t i o n - p i c t u r e work or other photography, neutral
density filters allow use of a large aperture to obtain diff e r-
ential focusing. You can use them when filming in bright
sunlight or with very fast films. These filters control expo-
s u r e when the smallest aperture is still too large. Also
available are KODAK WRATTEN Gelatin Filters with
combinations of neutral density and color conversion
filters (for example, No. 85N3). These filters combine the
light-conversion characteristics of KODAK WRAT T E N
Gelatin Filter No. 85 with neutral densities.
KODAK WRATTEN Neutral Density Filters No. 96
Neutral Percent Filter Exposure Increase
Density Transmittance Factor in Stops*
0.1 80 1
1
/4
1
/3
0.2 63 1
1
/2
2
/3
0.3 50 2 1
0.4 40 2
1
/2 1
1
/3
0.5 32 3 1
2
/3
0.6 25 4 2
0.7 20 5 2
2
/3
0.8 16 6 2
2
/3
0.9 13 8 3
1.0 10 10 3
1
/3
2.0 1 100 6
2
/3
3.0 0.1 1000 10
4.0 0.01 10,000 13
2
/3
*These values are approximate. For critical work, check by accurate tests, especially
if you use more than one fil t e r .
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