The cokin z pro 123s graduated b2 blue resin filter is color toned in one half of the filter and has a smoothly graduated transition into the clear portion colored and clear image portions can be brought into the desired position by adjusting the filter in the holder most cokin graduated filters are available in two densities 1 2 with 2 being darker cokin color graduated filters can also be combined with other cokin filters two color graduated filters rotated 180deg to each other allo