These clear/ND graduated filters by Schneider help to darken skies and other bright areas of the image. The filter is densest at the edge and tapers to clear by the middle, with a soft-edged line of transition between the density and clear areas. Neutral density filters do not affect the coloration of the image.
Available in 5.65x5.65 size.
ND .3 reduces incoming light by 1 stop.
ND .6 reduces incoming light by 2 stops.
ND .9 reduces incoming light by 3 stops.
ND 1.2 reduces incoming light by 4 stops.