9-gear adjustable viewing len Movie video Photographer Filter shadow highlight visual contrast reference Professional Viewfinder The 9-range density investigable viewing filter is a variable neutral density viewing filter with a filter coefficient of 2 to 512 times, allowing you to pre visualize exposure according to the lighting conditions used in film and photography. The viewing filter has a density range of 1 to 9 levels, from 0.3 to 2.7, which allows the filter to be used from very dim to exceptionally bright. While previewing your shot scene with this filter, you can also compress the visual contrast to accommodate the contrast of color film or digital sensors, which is much more limited than the contrast range of the human eye. This provides the ability to approximate the lighting ratio and better understand how shadows and highlights are displayed after recording. _x000D_