This cokin filter kit includes a filter holder grad grey nd2 121l light grad grey nd4 121m medium and grad grey nd8 121s soft filters these gradual neutral grey filters reduce the total amount of light reaching the film without affecting the colour balance each filter is clear at the bottom half with a gradual transition of the nd effect in the top half of the filter they produce a grey neutral tone and are used to reduce light enabling more control over the exposure and depth of fie