Neutral Density (ND) Filters
B+W ND (neutral density) filters, reduce the whole visible light spectrum in a uniform manner and thus lead to a reduction in light intensity without affecting color and contrast. Uses for ND filters - Sometimes large apertures are needed in bright ambient light in order to separate a model optically from the background. Using several minutes of exposure time, architectural photographers can make people passing through the work space “invisible”. In landscape photography, flowing water or the surface of the sea can be made to appear fluffy and soft like cotton candy.