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The Schneider Neutral Density 1.2-1.8 Combo Graduated Glass filters are a solid Neutral Density with another Neutral Density Graduated filter overlaid over half the filter. Therefore, this filter would be a 4-stop Neutral Density for 3.3" of it then gradually increase in density from the halfway point till it attains a full 6-stop ND at the edge.
Neutral Density filters have four main uses
To enable slow shutter speeds to be used, especially with high speed films, to record movement in subjects such as waterfalls, clouds, or cars
To decrease depth of field by allowing wider apertures to be used, which helps separate subjects from their background
To decrease the effective ISO of high speed film (above ISO 400) and allow it to be used outdoors in bright situations
To allow cine and video cameras (which have fixed shutter speeds) to film subjects such as snow, sand or other bright scenes which could cause overexposure
Neutral Density factors
ND.3 (exposure adjustment = 1 stop, reduces ISO 1/2)
ND.6 (exposure adjustment = 2 stops, reduces ISO 1/4)
ND.9 (exposure adjustment = 3 stops, reduces ISO 1/8)
ND1.2 (exposure adjustment = 4 stops, reduces ISO 1/16)
ND1.5 (exposure adjustment = 5 stops, reduces ISO 1/32)
ND1.8 (exposure adjustment = 6 stops, reduces ISO 1/64)
Schneider Neutral Density Attenuator filters feature crystal clear, water-white optical glass, protected against edge-chipping and delamination by Schneider's unique Edge Seal, which also significantly reduces edge reflections and flare
Schneider Quality Control
Schneider filters are ground and polished to a precise flatness and plane parallelism
Because all Schneider filters are designed and manufactured with the highest possible degree of consistency, you can swap like filters mid-shoot with no discernible variation in color or effect
In the Box
Schneider 6.6x6.6" Neutral Density 1.2-1.8 Combo Graduated Water White Glass Filters