Calumet 77mm ND4X Neutral Density MC Filter Calumet's Multi-Coated filters are a must for modern digital stills & camcorder lenses, particularly where lens hoods or compendium shades cannot be used. These outstanding filters offer revolutionary performance in light transmission, colour balance & flare control. Calumet Multi-Coated Filters minimise flare & ghost imaging in situations where unwanted light falls on the filters surface. The result is an average light transmission of over 97%, producing sharp contrast & well-balanced colour. Multi-Coated filters are available in a wide range of filter types & are highly recommended for maximising the performance inherent in multi-coated lenses. ND4X Neutral Density: Eliminates overly bright, washed out images by reducing the amount of light entering the lens without affecting colour rendition. Balances exposure & controls depth of field. 4X density = 2 f-stops. Can be combined to enhance effect.