Lee 4x6" Neutral Density Graduated Soft Resin Filter Set (Graduate 0.3 ND Soft, 0.6 ND Soft, 0.9 ND Soft)
The Neutral Density set can be used with all standard film types and contains graduated resin filters enabling photographer to adjust exposure over part of the photograph without affecting the color balance. Exposure can be controlled by 1, 2 or 3 stops, to suit the individual situation.
For example, when photographing a landscape in which the sky is much brighter than the foreground, placing the neutral density part of the filter onto the sky in the frame will reduce the sky exposure without affecting the foreground.
This enables cloud detail to be kept correctly exposed in the picture, and avoids the "white out" effect caused by exposing for the foreground.