The Pro Glass ND is an extremely high quality glass ND standard filter optimised for use with digital cameras, but equally useful for film. This new filter uses a surface coating made from evaporated metal, & therefore provides very even absorption across the visible spectrum & through the UV & Infra Red regions. Digital SLR users need to use ND standard filters to prolong exposure times in bright conditions for landscape photography, but the excess UV & IR can cause colour problems in some lighting situations. The Pro Glass filter reduces any chance of false colour casts, & also provides a result described as punchier on digital & film because the light forming the image is more specific to the requirements of the film or sensor.