The hama vario nd2 400 filter 67mm is a neutral density filter designed to reduce light that could be too bright variable neutral density filter with a rotating front lens exposure correction between 1 and 8 stop values possible to reduce light that is too bright vario nd2 400 has various applications it can allow the photographer to use large apertures while taking pictures outside backround gets hazy in the case of exposure times longer than 130 seconds water quotflowsquot if the