This ND plain filter reduces the amount of light reaching the film, but without affecting the color balance. Authorizes a 3 stops Shutter speed/ Aperture decrease. Aimed at the professional & enthusiast photographer, the Z-PRO series total over 80 different filters including coloured, centre spots, pastel/ diffusers to graduated & neutral density filters. Z-PRO filters are available in two different sizes. The plain filters, i.e. coloured, centre spots & pastel/diffusers measure 100x 100mm in size & the graduated filters 100x 150mm. All Z-PRO filters are manufactured from high quality CR39 organic glass & fit the Cokin Z-PRO holder system.