4×4 ND Straights – Neutral Density Filter Set.
Neutral density filters – 4×4 ND Straights – are colourless filters that remove light evenly across all spectrums.
Neutral density filters are used to lengthen exposure time, or allow the shooter to use a larger aperture.
Common uses are:
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Creating shallow depth of field during daytime
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Making water appear misty and ethereal
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Removing people from busy areas
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Transforming clouds and skies
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Adjust exposure on cinema cameras because shutter duration is fixed
ND filters are available between 1-10 stops of density, plus 13 & 16 stops for long exposure. The density of the ND is written either in the number of stops, or using the traditional density scale.
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0.3 = 1 stop
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0.6 = 2 stops
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0.9 = 3 stops
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1.2 = 4 stops
Be careful to note the difference. For example, a 6 stop filter could be labeled “1.8”, but a two stop filter could be labeled “0.6.”
So 3-4 stop ND filters – ie 0.9 and 1.2 allow street photographers to shoot their fast lenses “wide-open” even during the middle of the day.
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