These ND filters reduce light transmission uniformly over the visible region of the spectrum, in definitive steps. They are used mainly in colour photography for reducing light levels without colour change, and can also be used for black and white photography. They are particularly useful for compensating for too much light, in circumstances where changing the shutter speed, aperture or film type is not possible or desirable.
Lee Cyan 30 Resin Colour Correction Filter.
Made from high-quality optical glass, the Lee 100x100mm Big Stopper 10x Filter is a long-exposure ND filter designed to reduce the amount of light entering the lens by up to 10 stops. By greatly extending exposure times, it has the effect of allowing anything that is moving in your image to become blurred or ghost-like. The Big Stopper is compatible with the Lee 100mm Filter Holder (not included).
Lee Yellow 10 Resin Colour Correction Filter.
Lee Cyan 05 Polyester Colour Correction Filter.