The Cokin Gradual ND Kit H3HO-25 is a gradual grey filter kit to balance the light intensity within a scene. This is especially true in situations where you don't have total control over the light, such as in brightly contrasted landscapes.
Often in strong sunlight the sky will bite out and the foreground will become too dark, causing loss of details. The Coking Gradual Grey Filter cancels out the difference in light intensity, resulting in a balanced exposure.
- ND2 - P121L - 2X light: starts with the same neutral density as the 120 but the gray runs almost from
the edge and gradually to transparent. One stop compensation
- ND4 - P121M - 4X medium: the same gradual gradient as the 121L but with 2x the intensity. Requires two stops of compensation
- ND8 - P121S - 8X soft: twice the intensity of the 121M and the grey extends to 3/4 of the filter. Requires three stops of compensation.
