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The neutral
density filter reduces the amount of light entering the lens,
without effecting
colour. It is used
primarily when the light level exceeds that which the film
stock or video CCD can handle;
this
is often the case when shooting on a sunny day in a location
featuring an abundance of light reflection such a desert,
ocean or snowy landscape.
If a reduction in depth of field is desired, the ND
filter can help achieve this because it allows you to open the
lens aperture further without changing exterior light levels.
ND filters come in increments of 0.3, where each
increment is
equivalent to one stop. For
example, if a scene is overexposed by 2 stops use a 0.6 ND
filter to get proper exposure.
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3
x 3"
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3
x 4"
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4
x 4"
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4
x 5.65"
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5
x 5"
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5.65
x 5.65"
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6
x 6"
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6.6
x 6.6"
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