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The Graduated Neutral Density Kit from Cokin consists of three filters: 121L (1 stop), 121M (2 stops) and 121S (3 stops). Often it is necessary or desirable to balance the light intensity in one part of a scene with another. This is especially true in situations where you don't have total light control, as in bright contrasty landscapes. Exposing for the foreground will produce a washed-out, over-exposed sky while exposing for the sky will leave the foreground dark and under-exposed. Cokin graduated ND filters are part clear, part neutral density. They allow the transition to be blended into the scene, often imperceptibly.
These filters have several uses and offers the possibility to achieve very interesting results. They enable the shooter to adjust exposure without affecting color balance. An ND filter appears gray and reduces the amount of light reaching either the sensor of a digital camera or the film plane of a traditional film camera.
A Neutral Density filter is used to create some unusual special effects such as capturing the "blur" of the rippling water of a waterfall or the swirling effect of city traffic. Since it allows the use of slower shutter speeds in bright light, it becomes possible to create these special effects that would normally not be possible to capture without the filter. And, since it can also help to control your depth of field, it permits you to shoot at wider apertures. Ultimately, its value is in helping to prevent bright, overly washed out images shot in bright light.
Cokin filters are used worldwide by pro and amateur photographers. They present an affordable alternative to more expensive filter systems.
Note: Kit requires adapter rings
Cokin 121L - 1-stop Graduated Neutral Density (Light)
Cokin 121M - 2-stop Graduated Neutral Density (Medium)
Cokin 121S - 3-stop Graduated Neutral Density (Soft)
Neutral Density Filters Have Four Main Uses
To enable slow shutter speeds to be used, especially with high speed ISOs, 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 situation
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
Graduated Neutral Density
Cokin P: 85 x 100mm
121L = 1 stop 121M = 2 stops 121S = 3 stops
1 stop = reduces ISO by 1/2 2 stops = reduces ISO by 1/4 3 stops = reduces ISO by 1/8
Balanced light intensity from one part of a scene to another